Blanchet

Depressed

Middle row

Magic damage

Elementals

DPS Tier 2

Sync Rose

Shoots a Sync Rose that ricochets up to 3 times and deals Magical Damage to the enemy.
Sync Rose prioritizes targets who have not been attacked.
■ Magical DMG: 588%
■ Final Hit DMG: 882%

Blue Bird Garden

20 sec Cooldown

Shoots 3 Sync Roses to the enemy. Deals Guaranteed AoE Critical Damage on the final hit. All hits apply Silence.
Silence: Unable to use any skills.
■ Total Magical DMG: 1008%
■ Total Final Magical DMG: 1512%
■ Silence Duration: 6s

Passive

Increases Skill Damage.
Becomes immune to Silence.
Silence: Unable to use any skills.
■ Skill DMG Increase: 53%

Normal ATK

Basic:
Throws a blue rose and deals Magical Damage to the enemy.
■ Magical DMG: 60%
Enhance:
At a set chance, throws a blue rose, dealing Magical Damage to the enemy and applying Stinging.
Stinging: Reduces Recovery and applies Damage every second.
■ Magical DMG: 180%
■ Stinging Duration: 4s

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