[Blue Archive] You must pull, spark, get and build Aris (Armed) & Kei
TL;DR: Prioritize Kei because Support has high demand and wide usage. She's better than New Year Kayoko. If possible, get the others as well, Aris (Armed) can melt Mystic bosses (Including the new added boss Drumbarka effective in phase 1), Hoshino (Armed) can shred high-defense Mystic bosses and Shiroko Terror is back against Drumbarka (both effective against Drumbarka in phase 2),
I admit to having mistakes, Kei is indeed a Mystic Supporter as you may already know her but I got mix-up as the script says she provides Piercing efficiency instead of Mystic