Chapter 3
title: "The Undercroft Bargain" wordCount: 2991
Thalia's blade opened Caelan's cheek before he registered she had moved, and his blood hit the stone floor in a pattern that spelled 'amateur.'
He stumbled back, hand flying to his face. The cut wasn't deep, but it burned like she'd dipped the steel in acid. Around them, the Undercroft's training chamber stretched into shadow—carved stone walls slick with moisture, torches guttering in their sconces, and beneath his boots, old bloodstains that had seeped so deep into the rock they'd become part of the architecture.
"You telegraph every move." Thalia circled him, blade loose in her grip. She wore leather armor stripped of any insignia, her dark hair pulled back in a severe braid that exposed the burn scars crawling up the left side of her neck. "Your shoulders drop before you strike. Your breathing changes. Might as well send a written invitation."
Caelan pressed his palm harder against the wound. Blood welled between his fingers, hot and slick. "I wasn't ready."
"The Scorched Hand won't wait for you to be ready." She lunged.
This time he saw it coming. He threw himself sideways, rolling across stone that scraped his already-raw palms, and came up with his own blade drawn. The steel sang as it left the sheath—a sound his dead teacher had called the first note of every song worth singing.
Thalia smiled. "Better."
She came at him again, and this time Caelan met her strike. Metal shrieked against metal. The impact jolted up his arm, rattling teeth already loose from the blood magic he'd burned through at the academy. His vision still hadn't cleared completely. Dark spots danced at the edges, and every heartbeat sent fresh pain lancing through his skull.
"You are bleeding from more than your cheek." Thalia's blade scraped along his, seeking an opening. "How much did you spend tonight?"
"Enough." He twisted, trying to break the bind, but she moved with him like they were dancing. "I saved lives."
"You showed off." She disengaged suddenly, and he nearly fell forward from the loss of resistance. "There is a difference between power and control. You have one. Not the other."
The words stung worse than the cut. Caelan steadied himself, adjusted his grip. His mother's silver comb pressed against his scalp where he'd braided it into his hair—a reminder of what he'd lost, what he was fighting to reclaim. "Then teach me."
"Why would I do that?"
"Because you need me as much as I need you."
Thalia laughed, sharp and sudden. "Wait, no—you actually believe that." She lowered her blade slightly, head tilted. "You think because you have imperial blood and some half-trained magic, you are valuable to us?"
"I think you wouldn't have let me past your guard if you didn't see potential."
"I let you past because watching you die in the training ring would have been entertaining." But her eyes said something different. They catalogued him the way his teacher used to examine a new text—looking for hidden meanings, dangerous truths. "The Undercroft does not recognize bloodlines. Your father's name means nothing here. Your mother's sacrifice means nothing here. You want our support? Earn it."
She attacked again, and this time there was no warning, no circling. Just sudden, brutal violence that drove him back step after step. His blade moved on instinct, blocking strikes that would have opened his throat, his gut, his femoral artery. But blocking wasn't enough. She was faster, stronger, and she fought like someone who'd learned that hesitation meant death.
A feint to his left. He bought it, shifted his weight, and her boot caught him in the ribs. Air exploded from his lungs. He hit the ground hard, blade skittering across stone, and before he could move she was on him, knee on his chest, blade at his throat.
"You fight like someone who learned from books." Her weight pressed down, making it hard to breathe. "Not from survival."
Caelan's hand found stone. Found blood—his own, still wet. The water remembers. He pressed his palm flat against it, felt the familiar pull as the magic recognized his intent, his desperation, his rage at being pinned like an insect under glass.
The blood moved.
It crawled across stone, defying gravity, defying sense, and wrapped around Thalia's ankle like a living thing. She jerked back, startled, and that moment of surprise was all he needed. He rolled, grabbed his blade, came up swinging.
She blocked, but barely. For the first time since they'd started, she was the one retreating.
"There." Her voice carried something that might have been approval. "That is what I wanted to see."
The blood released her ankle, splashing back to the floor. Caelan's nose started bleeding again, adding to the mess already coating his face. His vision swam. The training chamber tilted sideways, then righted itself with nauseating slowness.
"Enough." Thalia sheathed her blade in one smooth motion. "You will kill yourself if you keep burning through power like that."
"I can handle it."
"No. You cannot." She walked to the chamber's edge, where a wooden bench held a collection of weapons and a water skin. She drank, then tossed the skin to him. "You use blood magic like a blunt instrument. All force, no finesse. It is going to get you killed."
Caelan caught the skin, drank. The water tasted of minerals and something metallic—probably blood, given where they were. "My teacher said power without control is just chaos waiting to happen."
"Your teacher was right." Thalia sat on the bench, started checking her blade for damage. "Who taught you?"
"Someone who is dead now."
"Obviously. I am asking who they were."
"Does it matter?"
"Everything matters." She found a nick in the steel, frowned at it. "You want the Undercroft's support, I need to know what kind of magic you are bringing to this alliance. Blood magic is not one thing. It is a thousand different techniques, each with their own cost, their own consequences. Some traditions teach sacrifice. Others teach symbiosis. Yours—" She gestured at his bleeding face. "Yours looks like self-destruction."
Caelan wiped blood from his upper lip. "It gets the job done."
"Until it does not." Thalia set the blade aside, pulled out a whetstone. The scrape of steel on stone filled the silence between them. "The Scorched Hand knew you would be at the academy. They set a trap specifically for you. That means someone is feeding them information. Someone close to you, or someone who can track your movements."
"I know."
"Do you? Because you walked into the Lower City alone, bleeding, barely able to stand. If I wanted you dead, you would be dead. If the Scorched Hand has people watching—and they do—you just made yourself an easy target."
The words hit harder than her boot had. Caelan's hand found the silver comb in his hair, touched it for reassurance. "I had to come. Davos would have tried to stop me."
"Davos is smart."
"Davos is cautious."
"Same thing, when you are dealing with blood magic and revolutionary cells." The whetstone scraped, scraped, scraped. "You want to know what I think?"
"I suspect you are going to tell me regardless."
A smile flickered across her face, there and gone. "I think you are running toward something instead of away from it. I think you came to the Undercroft not because you need our help taking the throne, but because you need to prove something to yourself. And that—" She tested the blade's edge with her thumb. "That makes you dangerous."
"To who?"
"Everyone. Including yourself."
The alcove Thalia led him to was barely large enough for two people. Stone walls pressed close on three sides, and the fourth opened onto a narrow corridor where shadows moved with purpose—other blood mages going about their business, pretending not to notice the bastard prince bleeding on their doorstep.
Thalia sat cross-legged on the floor, weapons spread before her like a merchant displaying wares. A short sword. Two daggers. Something that looked like a garrote made from braided wire. She cleaned each one with methodical care, her movements precise and practiced.
Caelan leaned against the wall, trying to ignore the way the room kept tilting. "You did not bring me here to watch you clean weapons."
"No. I brought you here because the training chamber has ears." She held up a dagger, examined it in the torchlight. "And what I am about to ask requires honesty."
"I have been honest."
"You have been strategic. There is a difference." The dagger went back into its sheath. "Why does a bastard prince want the throne when he could just kill Sera and disappear? You have the power. You have the motivation. One well-placed strike and you could vanish into the Lower City, live whatever life you wanted. So why the throne? Why the public claim?"
The question hung between them like a blade waiting to fall. Caelan's first instinct was to deflect, to give her the answer she wanted to hear. But Thalia's eyes were too sharp, too knowing. She would see through any lie he tried to construct.
"Let me be clear—" His voice came out rougher than intended. "I want them to see me take it."
"Them?"
"Everyone who watched them drag me through those gates twelve years ago. Everyone who pretended not to notice when my mother disappeared. Everyone who benefited from my father's cruelty and called it strength." His hands clenched, nails biting into palms already raw. "The empire does not just need a new ruler. It needs to see that bloodlines do not determine worth. That power can be challenged. That the old order can fall."
Thalia set down the weapon she'd been cleaning. "You want revenge."
"I want justice."
"Same thing, depending on who is holding the blade." But something in her expression had shifted. The calculating distance had been replaced by something harder to read—recognition, maybe, or understanding. "You know what happens if you take the throne? You become the thing you are trying to destroy. Another ruler. Another tyrant. Just with a different face."
"Not if I do it right."
"No one does it right. Power corrupts. It is what power does." She picked up the garrote, let the wire catch the light. "I have seen it happen. Good people, righteous causes, all of it turning to ash because they convinced themselves they were different. They were special. They were the exception."
"Then why help me?"
"Because maybe you are different. Or maybe—" The wire slipped through her fingers like water. "Maybe I want to be there when you prove you are not. When you make the same choices your father made, justify the same cruelties, become the same monster wearing a crown. I want to be close enough to put a blade in your back before you can do too much damage."
The honesty of it stole his breath. Not a threat delivered with heat, but a promise made with cold certainty. Thalia would help him take the throne, and if he failed to be better than what came before, she would kill him herself.
"That is the bargain?" Caelan pushed off the wall, moved closer. "You help me, but only so you can murder me later if I disappoint you?"
"That is the bargain." She met his eyes without flinching. "I have spent ten years fighting the empire from the shadows. Burn it down and start clean—that has always been the plan. But burning takes time, and people die in fires. If you can actually change things from the inside, if you can prove that the throne can be something other than a tool for oppression, then maybe we do not have to burn it all. Maybe we can build something new on the old foundation."
"And if I cannot?"
"Then the Undercroft will do what it has always done. Survive. Resist. Wait for the next opportunity." She stood, weapons sheathed, and extended her hand. "Do we have an agreement?"
Caelan looked at her hand. At the scars on her knuckles, the missing tip of her ring finger, the calluses that spoke of years holding blades. This was not an alliance built on trust or shared ideology. This was two people using each other, both aware of the knife at their back, both willing to risk it anyway.
He took her hand. "We have an agreement."
Her grip was iron. "The council meets in two days. They will want to see you, assess whether you are worth the risk. Blood mages have been hunted for three generations. Your father signed the execution orders personally. You think they are going to welcome his son with open arms?"
"I think they will recognize an opportunity when they see one."
"Maybe. Or maybe they will see a threat that needs eliminating before it can betray them." She released his hand. "You need to bring proof."
"Proof of what?"
"That you are not your father's son. That your claim to the throne is more than ego and revenge. That you actually give a damn about the people you are asking to risk their lives for you." Thalia moved toward the alcove's exit, then paused. "Two days, Caelan. Figure out what that proof looks like, or do not bother coming back."
She walked away, boots echoing on stone, and left him standing in the alcove with blood drying on his face and no idea what she meant.
The Undercroft's corridors twisted like a maze designed by someone who wanted visitors to get lost. Caelan followed the path Thalia had taken, but she'd already vanished into the warren of passages and chambers that made up the blood mages' sanctuary. Torches guttered in their sconces, casting shadows that moved with unsettling independence.
His head pounded. His ribs ached where Thalia had kicked him. The cut on his cheek had stopped bleeding, but it pulled every time he moved his jaw. And beneath it all, the hollow exhaustion of burned magic—a debt his body would collect with interest.
Proof that you are not your father's son.
What did that even mean? He'd spent twelve years being not his father. Twelve years refusing to use his name, his resources, his legacy. Twelve years building himself into something different, something better. Wasn't that proof enough?
But Thalia's words echoed in his skull, mixing with the pain and exhaustion until he couldn't tell which thoughts were his and which were just fear wearing a different mask. The council would see him as his father's son until he proved otherwise. And if he couldn't prove it—
A hand grabbed his shoulder, spun him around. Caelan's blade was half-drawn before he recognized the face.
"Easy." The guard from the entrance held up both hands, showing empty palms. "Just making sure you found your way out. People get lost down here. Sometimes permanently."
"I am fine."
"You are bleeding from your eyes again."
Caelan touched his face, found fresh blood. Damn it. "I said I am fine."
"Right. And I am the emperor's favorite dancing girl." The guard—a woman with grey-streaked hair and a scar that bisected her lips—gestured down the corridor. "Exit is that way. Try not to die before you reach it. Thalia would be annoyed if she had to clean up the mess."
"She seems like she would enjoy it."
"She would. That is what would annoy her." The guard's expression softened slightly. "Word of advice, princeling. Whatever proof you are planning to bring the council, make sure it is real. They have seen too many people promise change and deliver more of the same. You want their support? Show them something they have not seen before."
Before Caelan could respond, she'd turned and disappeared into the shadows, leaving him alone in the corridor with blood on his face and two days to figure out how to prove he was worth believing in.
He started walking toward the exit, each step sending fresh pain through his ribs. The Undercroft's walls pressed close, stone slick with moisture that might have been water or might have been something else. Somewhere in the distance, metal rang against metal—another training session, another blood mage learning to survive in a world that wanted them dead.
Proof that you are not your father's son.
The words followed him up the stairs, through the hidden door behind the butcher shop, out into the Lower City's pre-dawn streets where the air tasted of smoke and desperation. The sky was beginning to lighten, grey creeping across black, and somewhere a rooster crowed its challenge to the coming day.
Caelan pulled his cloak tighter, hiding the blood, and started walking. He had two days to find proof of something he wasn't sure he could prove. Two days to convince a council of hunted mages that the son of their greatest enemy was worth the risk.
Two days to figure out what the hell Thalia actually wanted from him.
His hand found the silver comb in his hair, touched it for reassurance. His mother had worn it the day they'd dragged her away. She'd looked back once, just once, and her eyes had said everything her mouth couldn't. Survive. Remember. Make them pay.
The water remembers.
Caelan turned down an alley, heading toward the boarding house where he'd been staying. His vision blurred again, dark spots dancing at the edges. He needed sleep. Needed food. Needed to stop bleeding from places blood shouldn't come from.
But first he needed to figure out what proof looked like when you were trying to prove you weren't the monster everyone expected you to become.
Behind him, the Undercroft's entrance sealed itself, becoming just another wall in just another building in the Lower City's endless maze. And somewhere in those depths, Thalia Vex cleaned her weapons and waited to see if the bastard prince would surprise her.
Or if she'd have to kill him after all.