Ui

Vivacious

Middle row

Magic damage

Elementals

Support Tier 1

Croaking Rain

Makes Croaking Rain fall on the surroundings, recovering allies HP and SP, and AoE Magical Damage to enemies every second. Recovery and Damage are applied to up to 9 allies and enemies each.
■ Continuous HP Recovery: 6.3% of Max HP
■ Continuous SP Recovery: 2.1% of target's Max SP
■ Total Magical DMG: 526%
■ Croaking Rain Duration: 6s

As I Said!

20 sec Cooldown

Croakie sings to grant the following effects to 3 different allies:
Fully restores HP and grants a Shield to the ally with the lowest remaining HP Ratio
Fully recovers SP of the ally with the lowest SP Ratio.
Inflicts mutate on a random enemy.
Mutate: Turns into a inanimate object and becomes unable to act.
■ Shield: 16% of max HP
■ Shield Duration: 6s
■ Mutate Duration: 5.2s

Passive

Reduces all allies Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 23%

Normal ATK

Casts Elemental Magic, dealing Magical Damage to the enemy
■ Magical DMG: 100%
Enhance:
At a set chance, croakie lashes her tongue out at the enemy,dealing Magical Damage to them and recovering SP for nearby allies.
■ magical DMG: 160%
■ SP Recovery: 20

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