Small (Magical Beast) CR 1
HP 6, hd1d10+1 AC 17 (+1 size, +6 natural), touch 11, flat-fooded 17 Fort +3, Ref +2, Will +0 Speed 20 ft. (4 squares), fly 30 ft. (poor) Initiative +4 Spot , Listen
Standard attacks BAB +1, Grapple +0
Attacks
Full attack: Slam +5 melee (1d4+4)
Special Attacks/Qualities
Darkness, improved grab, constrict 1d4+4
Blindsight 90 ft.
Skills Hide +10, Listen +5*, Spot +5*
Feats Improved Initiative
Str 16 Con 13 Dex 10 Int 2 Wis 10 Cha 10
Alignment Always neutral, Environment Underground, Organisation Solitary, pair, clutch (3?9), or swarm (6?15)

The darkmantle hangs from a ceiling by a muscular ?foot? at the top of its body. It can look like a stalactite, by holding its tentacles stiffly under itself, or like a lump of rock, spreading its tentacles so the membrane between them covers its body. Its shell and skin usually resemble limestone, but a darkmantle can change its color to match almost any type of stony background.
A darkmantle is about 4 feet long from the tips of its tentacles to the top of its head. It weighs about 30 pounds.

A darkmantle attacks by dropping onto its prey and wrapping its tentacles around the opponent?s head. Once attached, it squeezes and tries to suffocate the foe. A darkmantle that misses its initial attack often flies up and tries to drop on the opponent again.
Darkness (Su): Once per day a darkmantle can cause darkness as the darkness spell (caster level 5th). It most often uses this ability just before attacking.
Improved Grab (Ex): To use this ability, a darkmantle must hit a Large or smaller creature with its slam attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity.
If it wins the grapple check, it attaches to the opponent?s head and can constrict.
Constrict (Ex): A darkmantle deals 1d4+4 points of damage with a successful grapple check.
Blindsight (Ex): A darkmantle can ?see? by emitting high-frequency sounds, inaudible to most other creatures, that allows it to ascertain objects and creatures within 90 feet. A silence spell negates this ability and effectively blinds the darkmantle.
Skills: A darkmantle has a +4 racial bonus on Listen and Spot checks.
These bonuses are lost if its blindsight is negated. The creature?s variable coloration gives it a +4 racial bonus on Hide checks.

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System Reference Document -> List of Creatures (SRD)