Infernal Covenant Rune (IV)

+65% Damage to Burning enemies.

Fire Elemental gains Pyroblast as an additional ability.

Fire Elemental gains Fire Meteor as an additional ability.

Each cleared boss encounter of level 40 and higher has a 2% chance to drop a rune (1.5% on mini-boss stages). On Inferno 0.5% of those runes are Set Runes before the stage's loot bonus and Item Find, which raise it; on Normal and Nightmare no Set Rune drops. Only runes for the current hero's class drop.