This would be a power activated by mid-to-late level characters (exact level up for discussion). Essentially it would permit advanced mindcrafters to telekinetically hurl adjacent monsters directly away from them. They're the only class in the game to possess telekinesis, and this would add an interesting and versatile new dynamic to an ability that is defined by being able to move things with your mind.

Huge/massive monsters (titans, frost giants, stone giants, greater elementals, ancient dragons/wyrms, balors, any kind of moloch, etc) would pretty much ignore it. A message like "You mentally push at the *foo* with all your might! The *foo* barely flinches." might appear in such cases.

Large monsters (regular dragons, trolls, lesser giants, lesser elementals, etc) would be pushed one space away from the PC with a message like "You mentally push at the *foo* with all your might! The *foo* stumbles backward."

Smaller monsters (think ogres on down) would be pushed one space away from the PC with a message like "You mentally push at the *foo* with all your might! The *foo* is thrown to the ground!"

If the monster is huge, no damage.

If the monster is large, no damage (just pushed back) unless the space it would be pushed into is occupied by a wall, door, or another monster. In that case, the *foo* takes minor damage and the message would be something like, "You mentally push at the *foo* with all your might! The *foo* stumbles back into the wall/door/*bar*" If pushed into another monster, both *foo* and *bar* take minor damage.

If the monster is smaller, it takes minor to moderate damage from being thrown to the floor, moderate to major damage from being slammed into a wall or door, minor to moderate damage to both monsters if thrown into another monster. The message would change appropriately from "stumbles back into" as above to something like "is hurled into".

If a monster is thrown into a door, possibly there could be a chance the door could break.

Naturally some uniques would have to be immune for functional reasons. The eternal guardian/big casino guards are a couple of obvious examples. Others would be immune due to size or power (ancient stone beast, multi-headed chaos dragon, chaos archmage, and of course Andor Drakon, to name a few). Khelevaster (dying version) could simply be killed by the attack. Others, like Thrundarr, or shopkeepers, would be pushable, but obviously become hostile.

Now, I know this would be a pretty big addition (perhaps too big), but I think something like this would make the Mindcrafter class a lot more attractive. Telekinesis is one of the classic fantasy/comic/movie powers, and the funnest part about it is being able to throw things around.