Hunt Gabriel's three brothers, open 7-1's secret sanctum and beat Gabriel in P-3 for DUSK's arsenal and a teleporting golden arm.
ULTRAKILL + DUSK. Gabriel's three brothers are waiting at the exits of 1-4, 6-1 and 7-1. Kill all three and a sealed wall beside 7-1's exit cracks open onto a hidden sanctum with the way into P-3: GABRIEL, five phases across both Prime Sanctums, both of Gabriel's own boss rooms, the Void and a huge dark hall. Beat him and you get DUSK's whole arsenal, loaded from your own copy of DUSK, and a golden arm that teleports V1 where you aim.
The brothers. At the exit of 1-4 (Michael, orange), 6-1 (Raphael, pink) and 7-1 (Phanuel, green) you're pulled into that brother's own sealed hall, and he greets you in his own voice. Each is ULTRAKILL's real Gabriel with much more health and damage, plus his own moves:
The exit only opens once he's dead.
The secret room. With all three dead, the sealed wall beside 7-1's exit cracks open. Walk through it into a dark room with writing on the wall and a red portal: P-3.
P-3: GABRIEL. As you go in, Gabriel's crying echoes over a black screen; then he speaks to you in P-1's boss room. After you've found it once, P-3 is also in the level select's Prime Sanctum row, after P-1 and P-2.
After phase V he kneels and V1 shoots him. Then he wakes up in 6-2. (Cutscenes can be skipped with JUMP once you've beaten him.)
He gets stronger every phase. The Flesh Prison, Flesh Panopticon, Minos and Sisyphus never show up; it's only Gabriel.
Rewards. All ten DUSK weapons in slots 7, 8, 9 and 0: sickles, sword, pistols, shotgun, super shotgun, assault rifle, hunting rifle, crossbow, riveter and mortar. Their models, sounds and icons come from your own DUSK. You also get the golden arm: switch to it and punch to teleport.
Saving. Dead brothers, the rewards and your furthest P-3 phase are saved with your ULTRAKILL save slot: quit mid-P-3 and you pick up at that phase.
The gray terminal beside every shop shows which brothers are dead and has FIGHT AGAIN and REPLAY P-3 buttons. During any boss fight, the pause menu has RESTART BOSS FIGHT.
Made with Claude (Anthropic) for its Melty creator. The voice lines are the creator's own recordings. ULTRAKILL is by Arsi "Hakita" Patala / New Blood. DUSK is by David Szymanski / New Blood. Both games' content is read from your own installs at run time.
MIT. Remixing is welcome.
This is an unofficial fan mashup: it contains no files from either game. Everything from DUSK is read from your own install while you play. BepInEx and HarmonyX by their authors.