Just a few nasties for consideration. haa!
1- Giant Rat, simple idea. bites the player and infects them. Has 15% chance to call two smaller rats to its aid, when its health is low.
2- Lurking ShadeMan - is invisible in the dark, but becomes hostile when exposed to the light. Has 10% chance to envelope you in its arms, transporting you to the Shade realm (a hidden area of the hell biome) where lots of goodies await, with the cost of encountering lots of shadow themed hostiles. ( inky mare, skulking maiden, clouded darkbat )
3- Greedy Treasure Hunter - mad with desire for loot, these will attack the player on sight. has 15% chance to steal one of the most valuable items from the player when they at low health. You get the item back on defeating the greedy treasure hunter.
4- Masked trickster - dances around chuckling to itself, then removes its mask to reveal a hollow void where the face should be, vines lunge at the player from the void. Has 5% chance to open a portal to the Trickster's Masquerade party area, where there are valuable and rare items to collect, with the cost of too many items for the inventory, causing the player to make very hard choices.
5- Gambling Witch - Is blind and follows player/ environment noises by popping out her blind eyeballs and throwing them like dice to decide where to move to, but also has 25% chance of summoning her 'Cat', the Shackled Abomination.
6- Shackled Abomination- In life, it was a cat, but now, horribly disfigured from decay and witchcraft, it resembles only the shadow of what it used to be. Has 25% to be Summoned by the gambling witch, and forms a long rusty chain with her, guiding her around. Her 'dice eyes' now break open into tongues which crawl along the ground like caterpillars. On defeat this enemy drops deceptive dice, which can be thrown six times, each roll generating a random item or an enemy. can only be thrown inside the dungeon. If defeated in the second phase (with the 'cat') the player gets the deceptive dice and the stolen sack. the stolen sack contains four random dungeon themed items.