By mercier7 (113 – 1) on 2009/01/05 (Patch 3.0.3) Report
Does the fiery enchant damage increase with + spell power on Char ?
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mech6982 on 2009/01/07 (Patch 3.0.3)
No, Fiery does not benefit from spell damage... nor does it benefit from attack power.
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By Grunge (993 – 15) on 2009/10/21 (Patch 3.2.2) Report
Fiery doesn't benefit from spell or melee crit, but anything that gives "crit rating" (like the "Master of Anatomy" buff from skinning) will improve the chance of your fiery procs critting.