Velvet

Composed

Front row

Physical damage

Witches

Tank Tier 2

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Taunts enemies and recovers HP. Increases Attack during a set period of time.
Taunt Provokes attacks on the taunt.
■ HP Recovery: 365% of ATK
■ ATK Increase: 47%
■ ATK Increase Duration: 6s
■ Taunt Duration: 4s

Magic: centrifugal Separation

20 sec Cooldown

Spins rapidly, sweeping around with an axe, dealing AoE Physical Damage 11 times and applying Knockback to enemies. The final Hit deals greater Damage. While spinning, becomes Invincible.
Knockback: Is pushed back, becoming unable to act.
Invincible: Immune to all Damage and Debuffs
■ Physical DMG: 453.6%
■ Final Hit Physical DMG: 113.4%
■ Invincible: 3s

Passive

Increases Max HP.
■ Max HP Increase: 42%

Normal ATK

Strikes Down with her axe and deals AoE Physical Damage.
■ Physical DMG: 125%

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