health regen

[Noogy]

Trolls come with

Regeneration - passive
10% health regen bonus, 10% active in combat

and Shamans can get

Combat Endurance - Rank 1/1
Allows 10% of your health regeneration to work while in combat

So basically I am wondering if these stack to give you 20% regen. 
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The Internet says yes. Various other places agree, just google for combat endurance troll regeneration for more discussion.