A-to-Z Challenge Day 14 Xi (Ξ): "Ξ" Marks the Spot

Entry 14 for The Lost Catacombs of Kadmos

This room is tiled floor to ceiling in immaculately white 5'x5' marble tiles. Several of the floor tiles are engraved with the symbol for the letter Xi ("Ξ").

Each of the marked tiles is actually a trap door. Under each trap door is a skeleton armed with a sword and shield that attacks with a +1 initiative bonus.

In the far left corner of the room, the unmarked floor tile is actually illusionary, and disguises a 5'-cubed crawl space beneath it. Any one stepping on the illusionary tile (unaware it's illusionary) must roll their dexterity or under on 3d6 or they will sprain their ankle (slowing their movement to 1/2 normal until healed). The bottom of the crawl space is 5'x5' tile engraved with the letter Xi ("Ξ"); this is a trap door that opens to a shaft with a ladder than extends straight down for 30'.