Shaman · Elemental Combat · tier 2 · from level 15

Call of Flame

+64.0 Fire Nova

3/3 · level 60 · per cast · and 4 more

Call of Flame 123

Rank 3/3

Increases the damage done by your Fire Totems and by your Flame Shock, Fire Nova, and Lava Burst spells by 15%.

Fire Nova +15.0% +64.0 Flame Shock +15.0% +50.2 Lava Burst +15.0% +32.3 Magma Totem +15.0% +10.7 Searing Totem +15.0% +6.9

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.