#davrial

Have a boss who deals damage equal to their attack roll, and let the players figure it out for themselves

Gnomes but any time a non-gnome comments on how short they are as a casual comment or insult, they grow 1 inch taller

The god of death has merged with the god of balance and so every time you players kill something, something else of equal or HIGHER power comes back from the dead

Make a magic system that is very hard to pronounce and use both in-game and out, and name it tuezae. When people ask what it is, or eventually complain about it's difficulty, just tell them "It's hard, tuezae"

Make the big bad speak entirely in Middle English. Any player that does not respond in kind gets cursed entirely in Old English. If they can’t figure out what the curse does then they just get screwed over anyway. If the player then protests further they must then speak only in ancient Welsh or else be banned from the game