Stench. Any creature other than a fytridilit   that starts its turn within 5 feet of the fytridilit  must succeed on a DC 13 Constitution saving throw or be poisoned until the start of the creature's next turn. On a successful saving throw, the creature is immune to the stench of all fytridilit  for 1 hour.

Acidic skin. A creature that touches the fytridilit  or hits it with a melee attack while within 5 ft. of it takes 5 (1d10) acid damage.

fast sprinter 

The fytridilit can take the dash action as a bonus action,when it does so it gains a level of exhaustion.

Tail  Melee Weapon Attack: +3 to hit, reach 5 ft. ., one target. Hit: 4 (1d6 + 1) piercing damage, or 5 [rollable](1d8 + 1) and the target must make a dc 13 con save or take 3d6 poison damage be paralyzed until the end of their next turn.