Priest · Discipline · tier 3 · from level 20
Inner Focus
+58.8 Mind Blast
1/1 · level 60 · per cast · with Inner Focus active · and 1 more
Inner Focus
Rank 1/1
When activated, reduces the Mana cost of your next spell by 100% and increases its critical effect chance by 25% if it is a non-periodic spell and capable of a critical effect.
Averages, counting crits and misses, for a level 60 Priest 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.