Druid · Restoration · tier 1 · from level 10

Nature's Focus

Rank 5/5

Gives you a 70% chance to avoid interruption caused by damage while casting Arcane and Nature spells.

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

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