Damage Types
All damage is part of a damage type. If you know the type of damage a skill deals, you’ll know which damage reductions/limitation and damage increases/decreases will affect it.
Melee damage:
Melee damage is damage generally dealt by melee skills. Melee damage can be affected by damage reduction and limitation.
Ranged damage:
Ranged damage is damage generally dealt by ranged skills. Ranged damage can be affected by damage reduction and limitation.
Piercing melee/ranged damage:
If the melee or ranged damage is piercing, it will bypass damage reduction and limitation, but it will still be affected by protectors.
Affliction damage:
Affliction damage is generally dealt by afflictions. Affliction damage bypasses damage reduction, damage limitation and protectors.