Leets

Madness

Front row

Physical damage

Dragons

DPS Tier 2

Quenching Strike

Focuses briefly and reduces Incoming Damage. Whenever the allies in the front row take Direct Damage while Focused, additionally increases own Physical Damage and Incoming Damage Reduction and becomes immune to status that make her unable to act. When Focus ends, deals AoE Physical Damage to enemies and applies Stinging.
Direct Damage: Refers to damage caused by Direct Attacks, excluding Status Effect Damage and Damage Reflection.
Stinging: Reduces Recovery and applies Damage every second.
■ Physical DMG: 420%
■ Incoming DMG Reduction: 60%
■ Max Physical DMG Increase: 200%
■ Max Incoming DMG Reduction: 80%
■ Stinging Duration: 6s

Forge Hammering

30 sec Cooldown

Slashes the enemy 3 times and deals AoE Physical Damage. After the final slash, Leets moves back with Recoil.
■ Physical DMG: 210%
■ Final Hit Physical DMG: 315%

Passive

Increases Outgoing Damage to targeted enemies. Reduces Incoming Damage from targeted enemies.
■ DMG Increase: 126%
■ Incoming DMG Reduction: 46%

Normal ATK

Swings a greatsword and deals AoE Physical Damage to the enemy twice. The second hit deals a higher damage.
Physical DMG: 60%
2nd Hit Physical DMG: 90%
Enhance:
At a set chance, deals AoE Physical Damage and applies Knockback on the enemy.
Knockback: Is pushed back, becoming unable to act.
■ Physical DMG: 200%

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