Warlock · Destruction · tier 1 · from level 10

Bane

+70.5 Immolate

5/5 · level 60 · per second of casting · and 3 more

Bane 12345

Rank 5/5

Reduces the casting time of your Shadow Bolt, Immolate, and Incinerate spells by 0.5 sec and your Soul Fire spell by 2 sec.

Immolate +33.3% +70.5 Soul Fire +50.0% +35.7 Incinerate +25.0% +21.2 Shadow Bolt +20.0% +17.5

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