How to kill a 100pr troll
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You will need a friend and two copper tail rings.

When engaged with the troll, zap the troll with the rings:

You call forth the power of your tail ring.
Kalahar calls forth the power of his tail ring.
There is a flash of magic from Kalahar!
There is a flash of magic from tail ring!

Repeat this process until success:

You watch with self-pride as your shocking grasp hits Twohead the Troll.
YUCH, Twohead the Troll's entrails spill all over the place.
Twohead the Troll is DEAD, R.I.P.