Its main feature is if it bites you your are immune to radiation for 500 seconds with the side effect of it rarely taking away stamina,health,ect, but usually it never gives you any of these, hoped this helped!-C

Try taming it, setting to aggressive, then unclaiming it to have a lamprey when needed instead of searching for one every time.

Try to write Aberration correctly at first :P

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Stand over a fire if a leech is On you. If it gets on your tame go up to it their should be a hand click the hand and the leech will disappear