Priest · talent ability, from Mind Flay

Mind Flay

380per cast

Rank 6 · level 60 · before talents

Mind Flay

205 Mana20 yd range

Instant

Assault the target's mind with Shadow energy, causing 390 Shadow damage over 3 sec and slowing their movement speed by 50%.

Talents that change it, each at full ranks:
 Power Infusion · with Power Infusion active  +76.1 Improved Mind Flay  +76.1 Inner Focus · with Inner Focus active  +46.8 Shadowform  +44.7 Shadow Weaving · estimate: 5 Shadow Weaving stacks  +38.0 Darkness  +38.0 Shadow Focus  +11.9 Spiritual Guidance  +4.9 Mental Strength  +0.6

All 6 ranks

Rank	Level	Per cast	Per second
Rank 1	20	61.7	20.6
Rank 2	28	99.7	33.2
Rank 3	36	149	49.8
Rank 4	44	220	73.2
Rank 5	52	287	95.6
Rank 6	60	380	127

Plan a Priest build

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.