Herrscher of the Rimestar (Memorial Arena)
Last updated 2026-08-29
This article is about the Memorial Arena boss. For the Archive entry, see Herrscher of the Rimestar.
Type
Psychic
Boss Description
"In addition to the powers of Herrscher of Ice, it also showed the ability to manipulate gravity since its birth, with which it has wreaked havoc on the Coral Island — the central area of the island was completely destroyed, two of the platform isles collapsed, and the main island was on the verge of submersion... This exquisite pearl on the sea, which humanity had spent over a decade to polish, shattered at the moment of the birth of the Herrscher."
— Excerpt from "Statistics of Coral Island Herrscher Incident"
— Excerpt from "Statistics of Coral Island Herrscher Incident"
Recommended Features
Advantaged Features
Fire DMG
Ignite
Disadvantaged Features
Physical
Lightning DMG
Ice DMG
A construct born from the shadows, this formidable enemy manifests in an icy skeletal form. Based on the theory that the shadows use fear to construct beings, it is speculated to mimic certain traits of a terrifying foe from past encounters to become more aggressive. Perhaps engaging it in combat will shed light on how the shadows manipulate fear.
Herrscher of the Rimestar is one of the possible bosses in Memorial Arena.
Boss Attributes
Skill descriptions are shared across all Memorial Arena brackets. But the exact boss stats are (vastly) different across brackets.
C~SS Rank
- Pure Rimecell: Herrscher of the Rimestar is protected by its Herrscher powers. When the protective shield is on, the Herrscher enjoys high DMG Reduction. Use Fire DMG to weaken the shield. The Herrscher will be forced to enter a short period of vulnerable state upon shieldbreak, during which it can be Stunned and receive considerable bonus damage if attacked by moves or skills with strong interrupt effects.
Tip: It's suggested to first deploy a fast attacker who can deal Fire DMG to quickly break the Herrscher's shield and then switch to another Valkyrie who can perform moves with strong interrupt effects to Stun the Herrscher. - Rime Aegis: The Herrscher's shield provides a Fire DMG Reduction, which whittles the Fire DMG dealt to the Herrscher each time down to a fixed amount.
- Starry Night: The Herrscher soars into the air and summons some Rime Crystal from the ground, which will induce a massive explosion. Shatter all Rime Crystal to prevent the explosion and Stun the Herrscher.
Tip: Deploy Valkyries who can charge Ignite Trauma to quickly shatter the Rime Crystal.
SSS Rank
- Frost Guard: Frost surrounds Herrscher of the Rimestar making her immune to Ice DMG and take less Physical DMG as well as Lightning DMG. However, she takes more Fire DMG when ignited.
- Rimestar Bloom: When switching attack form, Herrscher of the Rimestar creates a Rimestar Bouquet on the field. The bouquet is formed by flowers of white, yellow, and blue, and among them there's a Frail Flower, which doesn't attack. Identifying and crushing the Frail Flower can greatly weaken Herrscher of the Rimestar.
- Rimesword: Combo: Herrscher of the Rimestar wields the blades to slash 4 times, and then raises 5 blades to cleave downward.
- Rimesword: Sweep: Herrscher of the Rimestar moves the blades to her two sides and strikes targets in the front with horizontal slashes.
- Rimesword: Ring Blade: Herrscher of the Rimestar combines the blades behind her back into a giant ring blade to circle the field and slash.
- Rimesword: Dive: Herrscher of the Rimestar summons the blades to gather above her head. After charging briefly, she casts the blades forward.
- Rimesword: Cleave: Herrscher of the Rimestar gathers all blades and each cleaves downward and forward in turn.
SSS Rank (Shadow of Rimestar)
- Frost Guard: Frost coats Shadow of Rimestar, making it immune to Ice DMG and more resistant to Physical DMG and Lightning DMG. However, it takes more Fire DMG when ignited.
- Shadowy Frigid Domain: After destroying the field and rising into the air, Shadow of Rimestar creates a pocket dimension. Hypothermia continuously accumulates on targets in the pocket dimension, and once it reaches its maximum, the targets are immediately frozen and suffer continuous HP loss. After the pocket dimension forms, Shadow of Rimestar summons multiple blades and lanterns, eventually condensing a giant ice sphere. When a target approaches a lantern, a blade falls to attack before shattering and vanishing; meanwhile, Hypothermia continuously accumulates on a target near a lantern. Once all three lanterns disappear, Shadow of Rimestar charges up and then controls the surrounding lanterns to destroy the ice sphere, triggering a field-wide explosion that deals massive Ice DMG to targets while inflicting a large amount of Hypothermia on them.
- Rimestar Fall: After Shadow of Rimestar destroys the field, numerous frozen rocks will fall, then an explosion countdown begins. When the countdown ends, all lanterns on the field will explode and disappear, dealing Ice DMG and inflicting Hypothermia on nearby targets. Destroying a lantern's special shield with Ignite Trauma will immediately defeat it, granting the current character 1 stack of Blazing Shadow and restoring some Astral Ring Intensity. Meanwhile, all team members gain 1 stack of Candle Shell; upon gaining Candle Shell, some Hypothermia is removed and some HP is restored; Candle Shell also reduces the Ice DMG and accumulated Hypothermia inflicted by Shadowy Frigid Domain based on its stacks.
- Rimesword: Combo: Shadow of Rimestar commands the blades to slash 4 times, before raising all 5 blades to deliver a downward slash in front of itself.
- Rimesword: Sweep: Shadow of Rimestar moves the blades to its two sides and attacks targets in the front with quick horizontal slashes.
- Rimesword: Ring: Shadow of Rimestar combines the blades on its back into a giant ring, which flies around the field and slashes.
- Rimesword: Dive: Shadow of Rimestar summons the blades above its head. After charging briefly, it launches the blades forward.
- Rimesword: Cleave: Shadow of Rimestar gathers the blades into a formation and brings them down in order in front of itself.
Gallery
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Enemy screenshot (Shadow of Rimestar) -
Enemy icon (Shadow of Rimestar)
Trivia
- All recommended features only apply at SSS Rank.
- Herrscher of the Rimestar's SSS variant was added in Version 7.2.
- Herrscher of the Rimestar's different SSS variant was added in Version 9.0 alongside a new description and gameplay.
- Herrscher of the Rimestar's different SSS form is called "Shadow of Rimestar".
- Herrscher of the Rimestar is the first boss to have two different SSS variants in Memorial Arena.
- Herrscher of the Rimestar has immunity to Rime Trauma, Stun Trauma, and Paralyze Trauma at SSS Rank (both versions).