Diana

Madness

Middle row

Magic damage

Werebeasts

Support Tier 1

Natural Healing

Swings her staff and recovers HP of 3 allies with the lowest HP Ratio. Slams the staff into the ground to provide additional HP recovery.
■ First HP Recovery: 44% of the target's Max HP
■ Second HP Recovery: 355% of ATK

True Healing Method

18 sec Cooldown

Unleashes a torrent of energy forward, dealing AoE Magical Damage 11 times to enemies and applies Knockback.
Knockback: Is pushed back, becoming unable to act.
■ Total Magical DMG: 630%

Passive

Reduces Incoming Critical Damage.
Increases all allied Madness Personality Apostles' attack.
(This effect activates even if Dianais is not on the field).
■ Incoming CRIT DMG Reduction: 42%
■ ATK Increase: 23%

Normal ATK

Basic:
Casts a spell, dealing Magical Damage to an enemy.
■ Magical DMG: 75%
Enhance:
At a set chance, casts an enhanced spell, dealing Magical Damage to the enemy and recovering the ally with the lowest remaining HP Ratio.
■ Magical DMG: 150%
■ HP Recovery: 275% of DMG Dealt

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