uncommon abjuration magus 

Cast [>] somatic; Requirements You're benefiting from Arcane Cascade.

Duration until the Arcane Cascade stance ends

You quickly adjust your Arcane Cascade to offer magical protection. You gain resistance 5 against damage from spells. As normal, using Arcane Cascade again means you've ended the stance, and the spell ends.

Heightened (+3) The resistance increases by 5.

Secrets of Magic, page 143.