Possible deathtrap for phase device. Either mark the inner floors as NOTELE or add levers also inside.
Assuming this is a good candidate for the revised CC, I'll definitely keep it in mind. Not that phases are particularly common on by dlvl5, but we certainly don't want any impossible scenarios. That aside, I'd like to hear if anyone likes this setup or if they'd prefer something different (and, if you can, explain what you'd like to see instead).
While we're on the subject of special level revisions, I do want to show the map draft I made for a potentially radicalized version of Spider's Lair: once I have access to my personal copy, I'll display it so everyone can see. (Kornel's pretty skeptical but I believe it will provide a far more interesting dynamic to the otherwise-empty landscape.)