Kamadan

The kamadan has advantage on Wisdom (Perception) checks that rely on smell.

If the kamadan moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn that target must succeed on a DC 13 Strength saving throw or be knocked Prone. If the target is knocked Prone, the kamadan can make two attacks—one with its bite and one with its snakes—against it as a bonus action.

The kamadan makes two attacks: one with its bite or claw and one with its snakes.

Melee Weapon Attack +5 to hit, reach 5 ft., one target. 6 (1d6 + 3) Piercing damage.

Melee Weapon Attack +5 to hit, reach 5 ft., one target. 6 (1d6 + 3) Slashing damage.

Melee Weapon Attack +5 to hit, reach 5 ft., one creature. 6 (1d6 + 3) Piercing damage, and the target must make a DC 12 Constitution saving throw, taking 21 (6d6) Poison damage on a failed save, or half as much damage on a successful one.

The kamadan exhales sleep gas in a 30-foot cone. Each creature in that area must succeed on a DC 12 Constitution saving throw or fall Unconscious for 10 minutes. This effect ends for a creature if it takes damage or someone uses an action to wake it.