Μ's Second-Years/Strategy

Strengths

• Most accessible source of VeilDebuffs will be nullified (1 time)
  "Veil" is an unofficial name used by the wiki for this status effect. Its actual in-game name is "Immune." in Light, which is extremely useful against most Dark bosses.
• Party-wide StrengthATK is greatly boosted based on how high HP is
  Strength: 10%-20%Duration: 3 turns is a powerful buff that is stronger relative to how high each party member's HP is. Light teams prefer staying at high HP, making Strength buffs particularly potent.
• 15% Light ATK UpLight ATK is boosted
  Strength: 15%Duration: 5.5 turnsApplied during the attack phase.
  On the next turn, it'll have 5 turns remaining. on Charge Attack buffs the party further and has relatively long uptime; the additional 500 HP is nice for keeping HP high.
•  Otonokizaka Second-Years10% boost to all allies' C.A. DMG. passively increases the whole party's C.A. damage as long as they are on the front lines.

Weaknesses

• A 9-turn cooldown on VeilDebuffs will be nullified (1 time)
  "Veil" is an unofficial name used by the wiki for this status effect. Its actual in-game name is "Immune." is extremely long, especially when the skill has no other effect. Any debuff that is inflicted while Veil is on cooldown will have to be waited out if no other form of debuff removal is available.
• Debuff is dual-sided, which does not stack with (and is overwritten by)  Miserable MistInflict 25% ATK DownATK is lowered
  Strength: 25%Base Accuracy: 80%Duration: 180 secondsStacking: Dual and 25% DEF DownDEF is lowered
  Strength: 25%Base Accuracy: 80%Duration: 180 secondsStacking: Dual on all foes.. Reaching the DEF Down 50% cap will require at least two other DEF Down skills that stack with each other.
• StrengthATK is greatly boosted based on how high HP is
  is a potent buff, but μ's on their own are not very good at maintaining the party's HP in tougher fights. 500 HP is a tiny cap easily reached even by relative beginners, and they have no means of boosting their healing output through Extended Mastery Perks.
•  Otonokizaka Second-Years10% boost to all allies' C.A. DMG. boosts C.A. damage, but not its damage cap; it may lose some value with players who can hit cap.

Characters

Light Staff characters for Atma Staff teams: Clarisse (Light), Fif, Io (Grand), Sarunan, Sophia

• Sophia: Sophia's "synergy" with μ's is by being away from the frontlines—she prefers sitting in the backlines, only appearing if  MetanoiaRevive an ally with 50% HP. is needed. Because Sophia's C.A. deals no damage, she won't benefit from  Otonokizaka Second-Years10% boost to all allies' C.A. DMG., and their Light ATK UpLight ATK is boosted
  on C.A. won't stack. However,  Zeyen PriestessWhen Sub Ally: 200 HP boost to Light allies' healing cap. passively boosts all healing caps by 200 HP, marginally raising μ's C.A. heal to 700 HP.