Regulus (MDA-21) is a limited time CHUNITHM Collaboration Partner in Arcaea. She was available to obtain from May 23rd, 2019 to June 20th, 2019, and was made available again from July 16th, 2020 to August 6th, 2020.

Awakening

Regulus (MDA-21) can be awakened at Level 20 by consuming:

  • 15 CHUNITHM Cores.

Stats by Level

Hover your cursor over a stat to see its corresponding multiplier.

LEVEL 1 2 3 4 5 6 7 8 9 10
FRAG
50
1.00×
50
1.00×
50
1.00×
50
1.01×
50
1.02×
51
1.03×
52
1.05×
54
1.08×
56
1.12×
58
1.17×
STEP
69
1.39×
69
1.39×
69
1.39×
69
1.40×
70
1.41×
71
1.43×
73
1.46×
75
1.50×
78
1.56×
81
1.63×
OVER
44
0.88×
44
0.88×
44
0.88×
44
0.89×
44
0.90×
45
0.92×
47
0.95×
49
0.98×
51
1.04×
55
1.10×
LEVEL 11 12 13 14 15 16 17 18 19 20
FRAG
61
1.24×
64
1.29×
66
1.33×
67
1.36×
69
1.38×
69
1.39×
70
1.40×
70
1.41×
70
1.41×
70
1.41×
STEP
85
1.72×
89
1.79×
92
1.85×
94
1.89×
95
1.92×
96
1.94×
97
1.95×
97
1.96×
97
1.96×
98
1.96×
OVER
58
1.18×
62
1.24×
64
1.30×
66
1.33×
68
1.36×
69
1.38×
69
1.39×
69
1.40×
69
1.40×
70
1.40×
LEVEL 21 22 23 24 25 26 27 28 29 30
FRAG
71
1.43×
72
1.45×
73
1.47×
74
1.49×
75
1.51×
76
1.53×
77
1.55×
78
1.57×
79
1.59×
80
1.61×
STEP
99
1.98×
100
2.00×
101
2.02×
102
2.04×
103
2.06×
104
2.08×
105
2.10×
106
2.12×
107
2.14×
108
2.16×
OVER
71
1.42×
72
1.44×
73
1.46×
74
1.48×
75
1.50×
76
1.52×
77
1.54×
78
1.56×
79
1.58×
80
1.60×

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:

Trivia

  • Regulus is named after a quadruple star system in the Leo constellation.
  • Regulus' awakening form is titled "レーベシュテルン" or "Levesturn" in CHUNITHM.
Partners
Base Partners HikariTairitsu
Story Partners Tairitsu (Axium)Tairitsu (Grievous Lady)Hikari (Zero)Hikari (Fracture)Tairitsu (Tempest)
Side Story Partners KouLetheEtoLunaSayaKanaeAlice & Tenniel

Lagrange

Collaboration Partners SapphireHikari & FisicaTairitsu & TrinHikari & SeineTairitsu (Grievous Lady) & Chuni PenguinLuna & Mia
Soundtrack Partners Hikari (Fantasia)Tairitsu (Sonata)Saya (Etude)
Limited-Time Partners StellaIlithShirabeHikari (Summer)Tairitsu (Summer)AyuEto & LunaYumeNono ShibusawaHaruna MishimaRegulus (MDA-21)Pandora Nemesis (MTA-XXX)Chuni PenguinDORO*CBrillante (E/S Primera)Ilith (Summer)SiaSeele HazeAreusIsabelle YagrushMir
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