I suggest stupidity added into the game as a material. It should be easily
mineable from thin air, since there is so much of it floating around. It
sounds freaky, but remember, this is a fantasy game. People can already put
weapons made of ice into a backpack made of fire and there is no problem
whatsoever there.

( personally im looking forward to refining stupidity to be divine stupidity,
mmmm)

++glaurung