Sewer Speech. Korex can comprehend and verbally communicate with Monstrosities.
Rancid Knife. Melee Attack Roll: +5, reach 5 ft. Hit:8 (2d4 + 3) Piercing damage plus 7 (2d6) Poison damage, and the target has the Poisoned condition until the start of Korex's next turn.
Entrancing Pipes. Wisdom Saving Throw: DC 12, one creature Korex can see within 120 feet. Failure: 14 (4d6) Psychic damage, and the target has the Charmed condition until the start of Korex's next turn. Success: Half damage only.