Oh. . . looks like I forgot to post this earlier when I got done so I might as well start. . .
Ogre, 100% attack / 120% health
Rage (damage increases 30% while injured)
Elemental, 100% attack / 65% health
Magical Attack, Mana Shield, Explodes (does damage equal to it's remaining health before defeat)
Giant Beetle, 75% attack / 140% health
Poisonous (players cannot steal life from this foe and become poisoned when walking over this creatures remains)
Anklebiter, 25% attack, 80% health
Hidden (revealed when clicked on; player receives damage without retaliation)
Grapple (player cannot move away)
Notes: Inspired by. . .
Treant, 80% attack, 165% health
Rooted (immune to PISOFF and WEYTWUT glyphs)
I was also thinking an enemy that steals one random item off your belt and drops it again when you kill it might be fun(I'm sure it would make a pretty annoying boss too when you "enchance" it's abilities!)