How are Trolls regaining their health when they don't have any spell buffs?

Trolls have a natural life regeneration. • Trolls will regain 3 HP every 30 seconds. Being that there are 3 military units to 1 group, in combat, this equals to 9 net HP regenerated.

• In addition to their in-combat regeneration, Trolls will automatically restore 25% of their maximum health when combat concludes. More.

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