Monster

monster, n., adj. 1. (n.) in general usage, an animal of strange or terrifying shape; also, a person of extreme ugliness, deformity, wickedness, or cruelty ; from Middle English monstre, from Middle French, from Latin monstrum "omen, monster," from monere "to warn"; c. 14th century. 2. in gamerese, descriptive of any combatant enemy creature or person in a fantasy milieu that is not a PC or demi-human (except orcs, which count as monsters). 3. any creature placed in a game with the purpose of combatting the PCs. 4. (adj.) highly powerful or successful.
Ex: That is one monster tank! [GJ1]