This flat black square looks like a piece of silken cloth, folded many times upon itself. Fleeting images of creatures and objects flit across the surface of the fabric.

Kobolds are among the finest trapmakers in the world, but this portable pit trap exceeds even their expertise. If you are lawful evil, lawful neutral, or neutral evil, an enveloping pit functions like a portable hole, except that it is 50 feet deep.
An enveloping pit covers a 10-foot square when opened fully, but the opening can be as small as 1 foot in diameter if it is laid upon the ground while still folded.
The pit opens fully only if it has enough flat space to do so; it stops opening when an edge hits a wall or an obstruction of similar size.

Relic Power: If you have established the proper divine connection, you can open or close an enveloping pit with a command word from anywhere within 60 feet.
A favorite kobold tactic is to lie in wait until foes are standing close to a concealed enveloping pit, then give the command word to open it. Any creature that suddenly finds an enveloping pit beneath it falls in. A successful DC 22 Reflex save allows the creature to move to an adjacent safe square, if one exists.
To use the relic power, you must worship Kurtulmak and either sacrifice a 5th-level divine spell slot or have the True Believer feat and at least 9 HD.

Lore: Centuries ago, Kurtulmak gave his high priests a half-dozen of these portable pit traps to aid them in acquiring new lands and wealth (Knowledge [religion] DC 20).

Prerequisites: Craft Wondrous Item, Sanctify Relic, plane shift.
Cost to Create: 1,500 gp (plus 600 gp for base item), 120 XP, 3 days.