Can be accessed by defeating Seraphim and then using a Sigil of Eternal Light on the locked gate.
[PROJECT: ICARUS], now commencing... You can sense them, right? It's time to fulfil your purpose. Show me what you can do, Silverling. Prepare yourself.
The Forsaken Conqueror

Boss Phases
100% to 80% (Phase 1) | True Seraoh teleports to 5 areas of the arena, each time firing projectiles at the previous location after teleporting. Throughout this phase, constant sources of bouncing projectiles are spread throughout the arena.
80% (Phase 2: Chicken) | True Seraph flies across the arena in a straight line, creating an expanding shot of feathers at the edge of the arena. True Seraph is invincible until the dashing is over.
80% to 20% (Phase 3: Bedrock) | True Seraph Pulls everyone to the middle of the arena. Waves of Celestial Fragments approach the player in a sinusoidal manner. Players must find the gap in the wave to avoid being damaged, while additionally evading the rolling Celestial Beams and Feathers True Seraph sends to the zone.
80% to 20% (Phase 3: Rain) | True Seraph flies in the air and starts throwing poisons which when reaching the ground, makes a small particle effect and then explode dealing massive AOE damage. Additionally eyes spawn around the arena, getting stabbed by a cross after a short period of time, causing them to shoot a giant spread of feathers
80.% to 20% (Phase 3: Slow Beams) | True Seraph slowly moves towards a person while summoning rolling Celestial Beams( which deal 30 base damage when they expire), True Seraph also shoots projectiles all around him four times and feathers spawn on the sides of the arena which then fly towards the zone.
80% to 20% (Phase 3: Fast Beams) | True Seraph flies into the sky near the middle of the arena and starts summoning an onslaught of Celestial Beams, which appear and dissapear very quickly, there's also a ton of feathers going through the arena constantly.
20% to 0% (Phase 4: Desperation) | True Seraph triggers his final phase, enclosing the arena in beams and having an intense amount of feathers fire from all sides. In addition, True Seraph fires a volley of shots at the player, indicated by a red laser that summons the feathers after a few seconds of spawning, after a slight delay True Seraph teleports to the location of where the shot was and shoots feathers all around himself.
10% (Phase 4) | True Seraph becomes armoured for a couple seconds.
[D̷̛͖̲̜̤̭̤̬̏͑́̌̇̽͛̊́̕̚͜'s PERSONAL LOG: AZRAEL] BYPASS STATE: As the sun dips below the horizon, one must grovel if they are to survive the darkness. But they chose to persevere. And continue to live...
End their suffering. This is my ultimatum.
Tips and Tricks
- It is recommended to use a weapon with a high cooldown and quick hit, so you can flick up and hit True Seraph. In the downtime of your weapon you can go back to looking down to focus on dodging.