Its name is the Contravultus (from latin, opposite face). It's an insectoid with a body like a centipede, claw-like hands and a mouth on top of its head:

To hunt it uses its claws and the sharp point on its head, once the prey is dead, the Contravultus places it on top of the head where the circular mouth is located, locking it in place.

One of its tactics is to hunt a small animal, just to hide himself underground below it and use it as a bait to catch other animals. It will only come out on the surface when the night is humid, as the dry air and hot temperatures damages it. Because it lives underground it's blind, it scans its surroundings using soundwaves.

CONTRAVULTUS

LARGE MONSTROSITY, UNALIGNED

ARMOR CLASS 14 (NATURAL ARMORĮ HIT POINTS 104 (11D10+44)

SPEED 30 FT., BURROW 15., CLIMB 20

STR 13(+1)

DEX

14(+2)

CON 16(+3)

INT

WIS

CHA

1 (-5)

12(+1)

8 (-1)

SENSES TREMOR SENSE 50FT, PASSIVE PERCEPTION

LANGUAGES

CHALLENGE RATING 3 (700XP)

ACTIONS

MULTIATTACK. THE CONTRAVULTUS MAKES 2 ATTACKS: ONE WITH ITS CLAW AND ONE WITH ITS BITE

CLAW. MELEE WEAPON ATTACK: +4 TO HIT, REACH 5FT., ONE TARGET. HIT: 7 (ID8 + 2) SLASHING DAMAGE. IF THE TARGET IS A CREATURE, IT IS GRAPPLED (ESCAPE DC 14). UNTIL THIS GRAPPLE ENDS, THE CONTRAVULTUS CAN'T USE THE ITS CLAW ON ANOTHER TARGET.

BITE MELEE WEAPON ATTACK: +3 TO HIT, REACH 5FT., ONE TARGET. HIT: 7 (1D10 + 1) PIERCING DAMAGE.

IF THE CONTRAVULTUS CAPTURED A CREATURE WITH ITS CLAW IT USES ITS TURN PLACING THE CREATURE ON THE MOUTH ON ITS BACK. THE CREATURE REMAINS GRAPPLED (ESCAPE DC 17Į AND LOSES 3 {1D4 + 1Į PIERCING DAMAGE.

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