Butter

Vivacious

Back row

Physical damage

Werebeasts

DPS

Butter Fly!

If there are multiple targets, fires a ricocheting shot that deals Physical Damage to the enemy.
■ Physical DMG Per Hit: 336%
■ Max Hit Count: 4 time(s)

Slingshot, Strike!

Launches a huge rock that deals AoE Physical Damage and Stuns enemies.
Stun: Becomes unable to act.
■ Physical DMG: 840%
■ Stun Duration: 2s

Passive

Increases Critical Rate.
Increases all allied Vivacious Personality Apostles' Attack.
(This effect activates even if Butter is not on the field.)
■ CRIT Rate Increase: 63%
■ ATK Increase: 23%

Normal ATK

Shoots a rock, dealing Physical Damage to the enemy.
■ Physical DMG: 100%
Enhance: At a set chance, fires a dog chew, dealing Guaranteed Physical Critical Damage to the enemy.
■ Physical DMG: 150%

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