I like this and will vote for it, and will accept if it’s beyond the scope of this proposal, but would like to think of a way to add temporary blockages between runs.

I also think this should carry a disclaimer prohibiting any room from being blocked on all four sides, either in the sense of having all outward pathways blocked or in the sense of having all inward pathways blocked.

Outward blocks look pretty balanced, to me: it’d cost +4 Puissance to wall up a room on all four sides, against the +5 Puissance benchmark for a straight Grievous Injury. Both end the run, but trapping Richardo won’t trigger any Glyphs.

Inward blocks seem expensive to set up given how many new rooms it requires.

And in both cases, these traps can be irreparably broken open (likely in the worst possible direction) by a single Devastation.

Up to you; I think we’ll see fortified Sepulchres eventually.

That sounds like enjoyable gameplay if it happens.

I like this both for the gameplay implications, and because it defines a word that can usefully be used for future Features.