Impervious

Level 1 of the Dungeon
(0, 0, D:1)
  a stone
(1, 2, D:1)
  a +0 short sword
(-23, 30, D:1)
  22 stones
(1, 33, D:1)
  a +0 chain mail
(-5, 43, D:1)
  3 stones
  a +0 whip
(-2, 47, D:1)
  15 stones

Level 2 of the Dungeon
(0, 0, D:2)
  25 stones
(5, 1, D:2)
  a +0 dagger
(-36, 3, D:2)
  a +0 hammer
(-34, 13, D:2)
  a +0 ring mail
(-39, 14, D:2)
  an adder skeleton
(-24, 17, D:2)
  19 sling bullets
(-5, 20, D:2)
  23 stones
(-2, 20, D:2)
  a +0 short sword
(-20, 25, D:2)
  an uncursed amulet of inaccuracy
(2, 32, D:2)
  20 stones

Level 3 of the Dungeon
(0, 0, D:3)
  2 stones
(-2, 1, D:3)
  a stone
(-3, 2, D:3)
  a stone
  a scroll of teleportation
(-3, 4, D:3)
  a stone
(-10, 10, D:3)
  a +0 robe
(-8, 14, D:3)
  a +0 robe