Keepsake Box

Cedar, a foot along each edge, lined in soft lead, with a lid that shuts without a sound and sits perfectly flush.

Time does not pass inside the box while the lid is shut. Nothing within ages, rots, dries, burns, bleeds, cools, or continues any process begun outside it: a lit fuse stops mid-length, a spreading venom halts, a severed hand keeps a century, a held breath is not spent. Interior is one cubic foot exactly and the lid will not shut on anything protruding. A creature small enough to fit is held in the same stillness and passes no time at all, though an unwilling one keeps the lid off itself with a Quick save and cannot be shut in at all while it can still move. Opening the lid starts everything again from the instant it stopped.