Day 22 - Favorite Monster Over All
This is a hard one to choose, since I have so many. That said, there are a few creatures I tend to favor over all others and I think this honor goes to....the Lich!
Liches are the personification of the mad mage seeking power at the cost of his own mortal coils, or on occasion such wizards seeking any means necessary by which to extend their own unnatural lives indefinitely. Liches can on rare occasion be good (the good lich was a rare thing that first manifested in 2E) but far more often they are irredeemably evil. In most editions they are nothing to sneeze at, major foes that are manipulating behind the scenes and the battle with a lich is usually quite deadly.