FREQUENCY: Uncommon
FREQUENCY: Uncommon ([Dungeon Level I])
FREQUENCY: Uncommon ([Cold Wilderness Mountains])
FREQUENCY: Rare ([Cold Wilderness Hills])
FREQUENCY: Rare ([Temperate Wilderness Hills])

NO. APPEARING: 2-12
ARMOR CLASS: 4
MOVE: 6" + special
HIT DICE: 2-5 hp
% IN LAIR: 35%
TREASURE TYPE: [SB]
NO. OF ATTACKS: 1
DAMAGE/ATTACK: 1 point/hp of the bowler (2-5)
SPECIAL ATTACKS: [SB]
SPECIAL DEFENSES: Nil
MAGIC RESISTANCE: Standard
INTELLIGENCE: Semi-
ALIGNMENT: Neutral
SIZE: S-M
LEVEL/X.P. VALUE: I | 5 + 1

A bowler is a boulder-like creature found in caves and similar places
where the rocks provide it with natural camouflage. A bowler is
extremely sensitive to sounds, vibrations, and odors, but it has no visual
organs. Upon sensing the approach of prey, a bowler rolls towards its
victim, gaining 1" of SPEED per round of combat, until a max. MOVE
of 15" is achieved. (The vibrations of its own movement enable the
monster to detect and avoid walls, pits, etc.) The bowler's attack form is
to roll over and crush victims. The weight of a bowler is approximately 28
pounds per hit point. After crushing prey, a bowler rolls back onto the
victim and a mouth-like orifice opens to consumes the flesh and bone,
shell, etc. Each bowler has a central core of a single beryl gem worth a <no base 10 gp beryls are listed in the DMG, as far as i know>
base of 10 gp. Bowlers will roll quietly at first, so there is only a 50%
chance that prey will notice them before they are within 40 feet of their
intended victim(s). Bowlers may be distant relatives of mimics (q.v.).