Priest · spell

Shadow Word: Pain

743per cast

Rank 8 · level 60 · before talents

Shadow Word: Pain

470 Mana30 yd range

Instant

A word of darkness that causes 762 Shadow damage over 18 sec.

Talents that change it, each at full ranks:
 Improved Shadow Word: Pain  +248 Power Infusion · with Power Infusion active  +149 Shadowform  +87.4 Shadow Weaving · estimate: 5 Shadow Weaving stacks  +74.3 Darkness  +74.3 Twin Disciplines  +37.2 Shadow Focus  +23.2 Spiritual Guidance  +11.7 Mental Strength  +1.1 Mental Agility per 100 mana +17.6

All 8 ranks

Rank	Level	Per cast	Per second
Rank 1	4	29.6	19.7
Rank 2	10	59.2	39.4
Rank 3	18	106	70.5
Rank 4	26	176	117
Rank 5	34	281	187
Rank 6	42	416	277
Rank 7	50	568	379
Rank 8	58	743	496

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.