Priest · Shadow Magic · tier 2 · from level 15

Shadow Reach

Rank 2/2

Increases the range of your offensive Shadow spells by 20%.

Doesn't change the damage or healing of any Priest spell.

Averages, counting crits and misses, for a level 60 Priest 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.