Trolls

The intensity of the battle slowed down, but they were still engaged against the overwhelming force of the forsaken. The handfuls of trolls seemed to have overturned the situation for them, as the stalemate tilted back on the forsaken again. Without the reinforcements, the human party wouldn't have much sway against the numbers...

Warden dodged the club of the troll, slashing his sword at its knee. Purple blood smeared on the rugged terrain for a moment, but the wounds instantly closed with renewed skin. Unlike the orcs which Warden had heard possessed energy negation ability, the regeneration power of these trolls was far superior. 

After all, the orcs were unable to negate his void energy, but the trolls were regenerating the wounds before his eyes. Warden would have to sever them completely and only then would they lose their regenerative powers. Unfortunately, with their massive form, severing even their limbs was a tremendously difficult task.