Erpin

Innocence

Back row

Magic damage

Sprites

DPS

Magic Bullet Rampage

Shoots 4 Magic Bullets at random enemies and deals AoE Magical Damage
■ Total Magical DMG: 1118.7%

Chaaaa...rge?

16 sec Cooldown

Completely infuses her staff with Magical Energy and charges, dealing AoE Magical Damage to enemies.
■ Magical DMG: 1050%

Passive

Increases SP Recovery of Enhanced Attacks.
Increases all allied Innocence Personality Apostles Attack.
(This effect activates even if Erpin is not on the field.)
■ SP Recovery Increase: 23%
■ ATK Increase: 23%

Normal ATK

Shoots a Magic Bullet, dealing Magical Damage to the enemy.
■ Magical Damage: 100%
Enhance:
At a set chance, secretly has some cake and recovers SP.
■ SP Recovery: 35%

Skill priority

You will level up most skills regardless how useful they are for the combat power padding in endgame. As a general rule of thumb:

Units you are not sure you will use long term: Skills to level 4. If they're passives that benefit the team, can take that to 7.
Strong units but not your main personality: Skills to level 7 for raids and elemental content. Not worth going higher if they are not your main team.
Strong units on your main personality (and waifus): Max out skills. You can start with 7/7/7 and slowly work towards 12/12/12 when you can sweep stage 10.

Recommended artifacts

Artifacts and runes will always change depending on the stage and content you are currently facing, this is just a couple of examples on what items work for this Apostle.

Legendary