Warlock · spell

Hellfire

3,080per cast

Rank 3 · level 60 · before talents

Hellfire

1300 Mana

Instant

Ignites the area surrounding the caster, causing 213 Fire damage to himself and 213 Fire damage to all nearby enemies every 1 sec. Lasts 15 sec.

Talents that change it, each at full ranks:

Master Demonologist · with your Imp or with your Succubus +308 Suppression +96.3 Ruin +53.2 Demonic Knowledge · with a demon +19.3 Cataclysm per 100 mana +26.3

Averages, counting crits and misses, with a typical weapon and no other gear or buffs, against a target your level. Talents at level 60. Worked out from the game's own data, the same way as the Foresight addon.