Bruce closed his eyes for a moment, deliberately, and made himself stop looking at the discs entirely — a trick he'd apparently picked up somewhere in his tinkering days, that staring harder at a problem rarely solved it faster than simply stepping back and letting the answer arrive on its own terms. Instead he thought back through the corridor behind them, the murals they'd passed without really stopping to study, piecing the sequence back together frame by frame in his own head.
"The murals," he said slowly, eyes still closed. "Not vibes, right. Actual story. It started with earth. The armies marching in, banners the color of the ground itself. Then the fighting, the actual battle, rendered in fire. Then after the battle, the wind carrying off all that ash and smoke. And at the very end, water, mourners, a funeral rite, grief closing the whole thing out." He opened his eyes. "Earth, fire, wind, water. That's the order the wall told the story in. What actually happened, in the order it happened."
"You're sure this time?" Xavier asked, still watching the room's shadowed corners for any hint of a third guardian.
"No," Bruce admitted. "But I'm considerably more sure than I was five minutes ago, and I'd rather commit to the version I actually reasoned through than the one I guessed at because it sounded neat."
"That's the most confident 'no' I've ever heard," Stephan said.
He walked himself through it once more out loud, mostly to make sure it held up under his own scrutiny before he committed to it a second time. "Think about it. Whoever built this wanted the story remembered, not solved. The murals weren't decoration. They were instructions, dressed up so nobody would think to read them that way. Earth marches in first because that's how every war actually starts, with feet on the ground before anything else happens. Fire is the fighting itself, the part everyone remembers, which is exactly why I jumped to it first last time and got it wrong. I let the drama of it convince me it belonged at the front instead of the middle. Wind comes after because that's what clears a battlefield once the noise stops. And water's last because grief always outlasts the actual violence. That's not a guess. That's just how stories about wars get told, if you actually let them finish telling themselves instead of skipping to the exciting part."
"That was almost poetic," Xavier said, surprised.
"Don't tell anyone. I have a reputation to protect."
Bruce turned the first disc, Earth's carved stone symbol grinding into alignment with a deep, satisfying click, and this time the mechanism stayed quiet, no ominous hum building beneath the floor, no answering shudder of rejection. He let out a slow breath and moved to the second.
"Feels almost rude that the story doubles as a security system," Xavier said, mostly to fill the silence while Bruce worked, sword still raised in case the room had any further surprises in mind.
"Feels almost rude that whoever built it expected people to actually pay attention on their way in," Bruce said, turning the second disc, fire, grinding into place with the same quiet click as the first. "Most people don't. I'm choosing to take some pride in that, honestly."
"Earned pride," Stephan said. "Assuming the door doesn't try to eat us again."
"It didn't try to eat us the first time. It just reset."
"I choose to believe it was building up to eating us, and we got lucky."
Bruce turned the third disc, wind, gale's symbol settling into place, and paused there for a long moment before reaching for the fourth, some old, hard-earned caution from the last attempt still lingering in his hand. "If I'm wrong about this..."
"You're not wrong," Xavier said, with considerably more confidence than he actually felt, watching the door for any sign of trouble. "You actually thought it through this time. Have some confidence."
Bruce turned it anyway, water's wave symbol clicking into its final position, and for a breathless second nothing happened at all. No hum, no shudder, no answer of any kind, just four discs sitting motionless in a wall.
Then the door shuddered, ground open with a heavy, grating sound that shook loose a fine rain of dust from the ceiling, and beyond it, a much larger, much darker chamber exhaled outward a breath of cold, stale air that smelled unmistakably, overwhelmingly of old bone.
"...I don't love that smell," Stephan said.
"Nobody likes that smell, let alone loves it," Bruce agreed, straightening, hammer already back in hand, though something in his posture had eased considerably now that the door had actually opened rather than punished him a second time.
Xavier lingered a moment at the threshold, studying the door's now-still discs, the carved elements finally aligned into whatever old story they were meant to tell. "We should remember this order," he said. "If we need to come back through in a hurry, I'd rather not solve a puzzle while something's chasing us."
"Extremely fair," Bruce said. "Earth, fire, wind, water. Noted, memorized, and, for the sake of my own dignity, never to be repeated wrong again."
"I'll hold you to that," Stephan said.
For a moment none of them moved, torchlight from the antechamber behind them spilling only a short way into the darkness ahead, the three of them standing shoulder to shoulder at the threshold of something none of them had a name for yet. Xavier could feel the cold pouring off the chamber beyond in a way that had nothing to do with ordinary underground temperature, a stillness that felt less like an empty room and more like a held breath.
Xavier peered through the opening, torchlight barely reaching past the threshold, catching just enough of what lay beyond to make his stomach drop clean through the floor — rows upon rows of alcoves stretching back further than the light could follow, each one holding a skeleton standing perfectly, patiently upright, and every single one of them, as far as he could tell in the dim light, had just turned its head toward the newly opened door.