Demon: Grim Reaper

The Grim Reaper is a new Demon for a Magic Realm expansion. 

His vulnerability is one step up from Tremendous: that is, he cannot be killed except perhaps by a lucky missile attack, a poisoned or magical blade, or perhaps a lucky lightning or fiery blast attack.  The Exorcize spell will kill him, but he is immune to Transform and Absorb Essence.

Seven Dwarves In Magic Realm Ruins Expansion

As long as Dwarf HQ and Dwarf 1 are played on their faster T3* attack side, the seven dwarves should have no difficulty finishing off the axe Goblins.  Things are a little more dangerous against the spear and greatsword goblins.

Skeleton King: Magic Realm Ruins Expansion

The Skeleton King and retinue are not as dangerous as some of the other opponents in the Magic Realm.  However the Skeleton King casts curses on his opponents, and two of the skeletons still have relatively sharp weapons.  The fastest characters, with move times of 2, can run from these opponents, but until the attackless speed 3 skeleton changes tactics, he prevents any characters with a move time of 3 or greater from fleeing.

Bears In the Woods: Magic Realm Forest Expansion

Best be careful, young adventur'r!  Thar's bears in them thar woods!

The Goblin King And Retinue: Magic Realm Expansion

With apologies to Liz Danforth, whose micro game art I have always loved, here is a mockup of the Goblin King and his Retinue, with Liz Danforth's artwork from TFT's Death Test repurposed for the occasion, including two archers, three axemen and one Goblin Shaman.

The Goblin King would be a special Treasure within Treasures site or treasure lair.  Among his possessions, a magical Dwarven Hammer or Throwing Axe (haven't yet settled on which it will be).