
Krivi |
although this isn't completely geared toward a crazy wizard, it could be used by one.
create a demiplane and then use permanent magics that prevent planar travel everywhere within the plane execpt for a 10ft square. place a the 30ft wide, 30ft long, 20ft tall room.
Next, place an Adamantine Golem in the center of the room with a 5th lvl or higher Symbol spell on the ground(your choice how it gets set off).
Then place an 'Energy Transformation Field'(3.5 spell) within the room, set to use SM9 or whatever tickles your fancy, along with the golem, whom you make immune to the SM9 when you set the spell's parameters.
And then insert some poor fool(s) who stumbled in via planar magic. Enjoy their terror when they realize that they cannot escape because their magic fuels the field, along with the triggered symbol, and they have to fight a never ending wave of SM9, along with the golem.