Regulus (MDA-21)

Regulus (MDA-21) is a limited collaboration Partner in Arcaea, added as part of the first Arcaea x CHUNITHM collaboration.
She can be obtained by purchasing the CHUNITHM Collaboration pack and playing her event map, which was first available from May 23rd to June 20th, 2019.
== Gameplay ==
=== Stats by level ===
=== Skill ===
Regulus (MDA-21)'s skill is unlocked at Level 8. It uses a modified version of the HARD Recollection Gauge that replaces the Rate gain per FAR note with a fixed Rate loss of -0.45. The Rate gain/loss for PURE/LOST notes is unaffected.
When using Regulus in Lost Chapter: Beyond, this -0.45 Rate penalty adds on to the Beyond Challenge's existing FAR note penalty.
=== Notes ===
Regulus is heavily focused on STEP, however her maximum FRAG stat reaches baseline level. She has a very high stat sum of 188.
She currently has the second highest maximum STEP count of any partner, surpassing Ilith by 3 STEP, and Tairitsu (Grievous Lady) by 6. Compared to Ilith and Tairitsu (Grievous Lady), she can overall give up to 2 more and 4 more steps respectively in world mode, which will accumulate over time and can definitely save some plays and extra energy usage.
This is all however countered by the fact that she is event exclusive, and requires 15 CHUNITHM cores, or equivalent to completing an entire map in said event. If she is unavailable for use, other high STEP partners are:
* Tairitsu (Tempest): Highest STEP but riskiest skill, can only be unlocked late-game.
* Ilith (Summer): Highest STEP stat without bonuses, but is event-exclusive.
* Tairitsu (Grievous Lady): Most readily available.
==Trivia==
* Regulus (MDA-21) is an original playable character in CHUNITHM. She debuted in CHUNITHM AIR ep.IV as part of the Metaverse character universe, with her signature song Supersonic Generation (by Massive New Krew)https://gamerch.com/chunithm/entry/488067https://gamerch.com/chunithm/entry/487295.
** Her name in Japanese is レグルス [MDA-21] (Regurusu [MDA-21]).
** Regulus shares the name of a bright quadruple star system in the Leo constellation, following the star naming scheme of several other CHUNITHM Metaverse characters.
* She has a second レーベシュテルン ("LöweStern") form that can be unlocked at level 15 via the EXCEED THE LIMIT mechanic (which functions like Arcaea's Awakening mechanic).
** Her default and awakened character art in Arcaea come from her default and LöweStern forms in CHUNITHM.
* Her skill, which is a stricter HARD Gauge, is similar to her 勇気のしるし ("Mark of Courage") skill in CHUNITHM.
** This skill causes immediate song fail after 150 note judgements below JUSTICE (i.e. ATTACK or MISS). This is a harder version of the 嘆きのしるし ("Mark of Grief") skill, which does not cause song fail until 300 note judgements below JUSTICE.
** Regulus' high STEP in Arcaea mirrors Mark of Courage's significant boost in the Gauge increase rate.
==References==
Category:Collaboration Partners