Blighted Centipede

Poisonous presence. When the centipede is hit by a melee attack the attacker must make a dc 17 con save or be poisoned for a minute. while poisoned in this way the target takes 2d4 poison damage at the start of their turn. 

Multiattack. The Centipede makes 2 claw attacks and a bite

Bite. Melee weapon Attack. +8 to Hit for (3d4+4 piercing damage) and the target must make a dc 17 constitution save or take 3d6 poison damage and be paralyzed for 1 minute. 

Claw. Melee weapon Attack. +8 to hit for (1d10+4 slashing damage)

Blight Extension. Recharge (5-6). Any creature within 45 feet of the centipede must make a con save dc 17 or be poisoned for a minute. While poisoned this way that target takes 2d6 poison damage at the start of their turn.