Shaman · Elemental Combat · tier 4 · from level 25
Improved Fire Nova
+85.3 Fire Nova
2/2 · level 60 · per cast
Improved Fire Nova
Rank 2/2
Increases the damage done by your Fire Nova spell by 20% and reduces its cooldown by 4 sec.
Averages, counting crits and misses, for a level 60 Shaman 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.