Mage · Arcane · tier 1 · from level 10

Improved Channeling

Rank 5/5

Gives you a 100% chance to avoid interruption caused by damage while channeling Arcane Missiles and a 70% chance while casting Arcane Blast.

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

Plan a Mage build

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