Warlock · Affliction · tier 4 · from level 25

Malevolence

+41.8 Bane of Doom

5/5 · level 60 · per cast · and 9 more

Malevolence 12345

Rank 5/5

Increases the critical effect chance of your Shadow spells by 5%.

Bane of Doom +2.5% +41.8 Bane of Agony +2.5% +13.2 Death Coil +2.5% +11.0 Corruption +2.5% +10.5 Drain Soul +2.5% +10.1 Siphon Life +2.5% +9.8 Shadowburn +2.5% +6.6 Shadow Bolt +2.5% +6.4 Drain Life +2.5% +6.1 Wrack +2.5% +5.2

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.