i m stuck in luxuno dungeon depth 16, it seems to be a dead end, have tried different set of stairs in depth 15, still the same dead end in depth 16.... help

Here's the dead end mentioned above, help!

Laxuno's a really tricky guy. Are you sure that's a dead end?

Spoiler:
	The final floor for each archmage exemplifies that archmage's personality. Laxuno is an arrogant intellectual, so his floor is full of puzzles and other mean tricks. Illusions are a favorite trick.

thx really much, stupid me~