All Frost Trolls, with the exception of one spectral one in a quest, are level 22 with 460 health which they can regenerate at a fixed rate. Regular trolls however are weaker, level 14, 280 health.
Perhaps the regeneration made it feel different?
Maybe it was some random bug then. The only reason I'm so sure of what I saw is that I was sure of death when I clapped eyes on it, and was so shocked at the ease of the fight. I know what I saw! (god I sound like I was abducted by aliens or something lol)
Ah well, never mind. Bottom line is, indeed, destro needs some serious tweaking. If NPCs can blow 100's of health off with one spell, the player should be able to as well.
