Description
Allows 17/33/50% of your Mana regeneration to continue while casting.
Position confidence
row: Confirmed (talentsforever.com JSON + foreverchanges.pro tier listing); column & arrow: Reported (explicit only in talentsforever.com data/mage.json)
Change notes
Classic: 5/10/15%. Icy Veins: 50% at max rank. Column 4 -> 3.