scathe.

After you complete the pharos, you can get it from the secret merchant in the Necrohol of Nabudis.

That's tough. It means to harm or injure, but using it just sounds odd. I would use the negative and say "He escaped unscathed." or the adjective form "It was a scathing attack." A correct sentence would be "I will scathe you." but it is awkward and no one would know what you were saying. Scathe can also mean to criticize or denounce severely. I have used this word in this sense of definition a few times. An example being, "She would have scathed at the idea of doing such and such". But, the negative, unscathed, is much more common and will be more widely understood.

excoriate, peel, skin, scalp, lash, whip, scathe, scarify, scold, scourge, thrash, beat, blister, deprive, strip, steal, snatch,

Math, hath, path, wrath, lath
Bath and math