Eternal Radiance

Eternal Radiance is a boss added as apart of the Eternal Palace DLC. She can be fought in a secret area within the Eternal Palace, and is the strongest form of the Radiance, even harder than the Absolute Radiance.

Lore
The Eternal Radiance is the purest, flawless form of the Radiance. Following her defeat in both her own dream and in Godhome, she was able to escape from the Shade Lord and free herself. She had taken the remnants of the power from the Attuned Gods of Godhome, and had used the power to become “Eternal.” She was deemed too much of a threat, and was imprisoned by The Pale Titan in a hidden area of the Eternal Palace.

Trapped in the Palace, when battling the Knight, she summons her most loyal followers to fight the Knight alongside her.

Location
To Be Revealed...

Behaviour and Tactics
Eternal Radiance now wears a protective helmet as a souvenir from Godhome, giving her more health than in her previous battles. Her attacks are much quicker and have gone through various changes.

A major difference is that she has less phases than usual, and no staggers besides the final one. When she is defeated in phase 1, the climb begins instantly, where she moves above the screen and shoots down beams at you. Once you reach the top, you are not in the final phase. Instead, Phase 2 begins, and plays out like Phase 4 in the Absolute Radiance fight with multiple platforms spread out and Eternal Radiance teleporting more often.

She is also higher than the original fight in Phase 1, making it harder for you to reach her from the ground. Additionally, you can no longer gain SOUL from hitting her, which means your SOUL bar can only be refilled when you strike the enemies she summons.
 * Beam Burst: Eternal Radiance's Beam Burst is extremely fast, and the beams are slightly larger.
 * Sword Burst: 16 swords are launched instead of 12, and they are no longer summoned in a clockwise patten, and instead all spawn instantly. Three sets of swords and launched instead of two.
 * Sword Barrage: Eternal Radiance launches a large barrage of swords that shoot off in a single direction towards the Knight. They continue to follow the player, and requires moving in-between the swords from the top to dodge.
 * Shockwave: A circle of essence begins to form above the arena, similar to when an enemy is about to be summoned, but instead of an enemy being spawned, a large corpse or broken platform will drop and create a large shockwave in both directions. Double Jump and Shade Cloak, or Descending Dark, are required to dodge this.
 * Dream Shields: The Radiance has two Dream Shields similar to Markoth, that spin around her. This makes her more dangerous, and also increases the chances that you miss when swinging at her.
 * Wall of Light: Two beams will now close in instead of one.
 * Spike Floor: Spikes are come up 0.6 seconds after the ground light, making them a large threat and nearly instant. They also have a chance to cover the full ground in Phase 1, and up to two full platforms in Phase 3.

Enemy Spawns
Eternal Radiance can summon enemies similar to The Pale Titan, however, her essence indicator is gold instead of white. Mini-bosses are also spawned similar to in the Colosseum, with lesser health and size adjustments (Brooding Mawlek). Due to the Eternal Radiance's unique arena, Gruz Mother will not perform her Wild Slam attack, and the leap/dash attacks from Crystal Guardian, Brooding Mawlek, and Soul Warrior will end when they reach the edge of the platform to prevent them from falling off.
 * 2-4 Squits
 * 1-2 Furious Vengeflies
 * 2 Primal Aspids
 * 3 Mossy Vagabonds
 * Mantis Petra
 * Lesser Mawlek
 * Great Hopper
 * Vengefly King (100 health)
 * Gruz Mother (100 health)
 * Soul Warrior (200 health)
 * Crystal Guardian (250 health)
 * Brooding Mawlek (300 health)

In the second phase, Great Hoppers, Brooding Mawleks, and Soul Warriors will not spawn due to the altered arena. Crystal Guardian will now leap through platforms when performing his leap to prevent him from falling off, and Gruz Mother can now perform her wild slam attack. Up to two Mantis Petras can now spawn, and only one Mossy Vagabond will spawn.

Tips

 * It is recommended to save your SOUL for healing instead of using spells, as it is hard to gain SOUL in this battle.
 * Monarch Wings can be useful to gain height and damage the Radiance. If Spell Twister is equipped, you could potentially damage her by leaping up and using Abyss Shriek before falling. This is risky as it exposes the Knight and leaves it open to attacks.
 * The Weaversong/Grubsong combo can be used to extract extra SOUL from enemies. The Weaverlings cannot damage the Radiance herself however, and they wouldn’t extract SOUL regardless.
 * Soul Catcher and Soul Eater is useful for gaining SOUL from enemies, as SOUL is very scarce during this battle.
 * Most mini-bosses can be are dangerous foes if you are caught off guard. It’s recommended to deal with them first.