Guardian mastery needs to be reworked. Armor bonus (1) is boring, (2) has no impact on the active tanking rotation, (3) is severely diminished on fights with mostly magic damage, and (4) is often ignored for hard-hitting boss mechanics.
Instead, have mastery do two things:
- Each time you use Frenzied Regen, you gain a stack of Empowered Savage Defense (stacks to 5). Using Savage Defense consumes the stacks and gives a 10 second damage reduction buff of X% per stack. Mastery increases X.
- Each time you use Savage Defense, you gain a stack of Empowered Frenzied Regen (stacks to 5). Using Frenzied Regen consumes the stacks and gives 15 seconds of extra health. Mastery increases life gain.