I once had a 25th level Sorcerer played by my buddy Dillenger. UnIce inspired an idea for a trap...
Imagine a massive block of black ice that blocks a passage. Delving reveals it is (ice that never melts, forget the name). Deep in the block are runes, but these are extremely hard to make out even with detection spells. Regardless, the party successfully delves that the block exist to destroy any who try to pass. Dillenger gave a hearty laugh and UnIced it, only to discover the rune was a Magus BE NOT word of power. In a flash, as if hit by Balefire, the sorcerer was unmade, having never existed. This also meant no one had ever destroyed the block of ice so it magically reformed.
The party never did get into that armory/room.