Black Pebble

Object 'black pebble worrying stone' type treasure, extra flags magic.

Weight 10, value 0, level 13.
Object Quality (10 / 10 hps)
Modifies hit roll by 2 continuous.
Modifies armor class by -5 continuous.

From aelmon:16s 5w 5n w s.
From Midgaard Royal Surveyor: [n] 2n.

Pebble is on the ground in "a Submerged Foundation"