Trolls (not in the forum, in the game!)

[AK_Marty]

So I noticed Mire Trolls are allergic to fire darts, makes them run away
But how do you send them to the great bog in the sky? They insist on healing themselves at an alarming rate! Any suggestion??

[Randomizer]

You need to use a spell that does more damage per attack like fireball or compressed air.

[okashii]

Trolls have a nasty habbit of regenerating and resisting magic spells if they succeed a defense roll, however it is perfectly doable to kill them one by one from afar with a lvl6 fire dart or fleshboil. Save your game, cast from as far as you can and hope for the kill. Around 7 casts or so should do the trick.
If it doesn't work because they resisted most of the spells - just try again.

[Krafen]

Fire Dart 6 should take care of them without much difficulty. Just try and chase them into a corner so you don't keep losing LoS.