Warlock · Destruction · tier 4 · from level 25

Intensity

Rank 3/3

Gives you a 70% chance to resist interruption caused by damage while casting or channeling any Destruction spell.

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

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