Ui

Vivacious

Middle row

Magic damage

Elementals

Support Tier 1 Yearning: Tier 0

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: 3% of own Max HP
■ Continuous SP Recovery: 1% of target's Max SP
■ Total Magical DMG: 250.5%
■ Croaking Rain Duration: 6s

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: 3.3% of own Max HP
■ Continuous SP Recovery: 1.1% of target's Max SP
■ Total Magical DMG: 275.55%
■ Croaking Rain Duration: 6s

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: 3.6% of own Max HP
■ Continuous SP Recovery: 1.2% of target's Max SP
■ Total Magical DMG: 300.6%
■ Croaking Rain Duration: 6s

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: 3.9% of own Max HP
■ Continuous SP Recovery: 1.3% of target's Max SP
■ Total Magical DMG: 325.65%
■ Croaking Rain Duration: 6s

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: 4.2% of own Max HP
■ Continuous SP Recovery: 1.4% of target's Max SP
■ Total Magical DMG: 350.7%
■ Croaking Rain Duration: 6s

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: 4.5% of own Max HP
■ Continuous SP Recovery: 1.5% of target's Max SP
■ Total Magical DMG: 375.75%
■ Croaking Rain Duration: 6s

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: 4.8% of own Max HP
■ Continuous SP Recovery: 1.6% of target's Max SP
■ Total Magical DMG: 400.8%
■ Croaking Rain Duration: 6s

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: 5.1% of own Max HP
■ Continuous SP Recovery: 1.7% of target's Max SP
■ Total Magical DMG: 425.85%
■ Croaking Rain Duration: 6s

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: 5.4% of own Max HP
■ Continuous SP Recovery: 1.8% of target's Max SP
■ Total Magical DMG: 450.9%
■ Croaking Rain Duration: 6s

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: 5.7% of own Max HP
■ Continuous SP Recovery: 1.9% of target's Max SP
■ Total Magical DMG: 475.95%
■ Croaking Rain Duration: 6s

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% of own Max HP
■ Continuous SP Recovery: 2% of target's Max SP
■ Total Magical DMG: 501%
■ Croaking Rain Duration: 6s

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 own Max HP
■ Continuous SP Recovery: 2.1% of target's Max SP
■ Total Magical DMG: 526.05%
■ Croaking Rain Duration: 6s

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: 6.6% of own Max HP
■ Continuous SP Recovery: 2.2% of target's Max SP
■ Total Magical DMG: 551.1%
■ Croaking Rain Duration: 6s

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: 6.9% of own Max HP
■ Continuous SP Recovery: 2.3% of target's Max SP
■ Total Magical DMG: 576.15%
■ Croaking Rain Duration: 6s

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: 7.2% of own Max HP
■ Continuous SP Recovery: 2.4% of target's Max SP
■ Total Magical DMG: 601.2%
■ 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 an inanimate object and becomes unable to act.
■ Shield: 5% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 3s

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 an inanimate object and becomes unable to act.
■ Shield: 6% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 3.2s

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 an inanimate object and becomes unable to act.
■ Shield: 7% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 3.4s

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 an inanimate object and becomes unable to act.
■ Shield: 8% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 3.6s

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 an inanimate object and becomes unable to act.
■ Shield: 9% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 3.8s

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 an inanimate object and becomes unable to act.
■ Shield: 10% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 4s

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 an inanimate object and becomes unable to act.
■ Shield: 11% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 4.2s

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 an inanimate object and becomes unable to act.
■ Shield: 12% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 4.4s

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 an inanimate object and becomes unable to act.
■ Shield: 13% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 4.6s

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 an inanimate object and becomes unable to act.
■ Shield: 14% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 4.8s

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 an inanimate object and becomes unable to act.
■ Shield: 15% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 5s

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 an inanimate object and becomes unable to act.
■ Shield: 16% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 5.2s

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 an inanimate object and becomes unable to act.
■ Shield: 17% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 5.4s

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 an inanimate object and becomes unable to act.
■ Shield: 18% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 5.6s

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 an inanimate object and becomes unable to act.
■ Shield: 19% of Max HP
■ Shield Duration: 6s
■ Mutate Duration: 5.8s

Passive

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 12%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 13%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 14%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 15%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 16%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 17%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 18%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 19%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 20%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 21%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 22%

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

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 24%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 25%

Reduces all allies' Incoming Damage from Skill Attacks.
■ Incoming Skill ATK DMG Reduction: 26%

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

Yearning (aside)

Croak-Croak Croakie

Increases the bearer's Max HP, Physical Defense, Magical Defense, CRIT Resistance, and CRIT DMG Resistance.
■ Max HP Increase: 6%
■ Physical DEF Increase: 6%
■ Magical DEF Increase: 6%
■ CRIT Resistance Increase: 6%
■ CRIT DMG Resistance Increase: 6%

Ui, Queen of Positivity

Adds 1 additional Vivacious Personality.
When Freshman Skill is used, increases the Damage for Middle Row allies.
■ DMG Increase: 16%
■ DMG Increase Duration: 7s

Ui in Boots

Reduces Incoming Damage for Middle Row allies.
■ Incoming DMG Reduction: 14%
■ All HP: 4%
■ All Magical ATK: 4%

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 10.
Strong units but not your main personality: Skills to level 10 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 10/10/10 and slowly work towards 12/12/12 when you can sweep higher stages.
What about Yearnings? They unlock skills up to level 15. SUPER EXPENSIVE, only worth for your main team or really meta characters.

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