Legendary Resistance (1/Day). If Yestabrod fails a saving throw, it can choose to succeed instead.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit:8 (3d4 + 1) bludgeoning damage plus 7 (3d4) poison damage.

Caustic Spores (1/Day). Yestabrod releases spores in a 30-foot cone. Each creature in that area must succeed on a DC 12 Dexterity saving throw or take 1d6 acid damage at the start of each of Yestabrod's turns. A creature can repeat the saving throw at the end of each of its turn, ending the effect on itself on a success.

Infestation Spores (1/Day). Yestabrod releases spores that burst out in a cloud that fills a 10-foot-radius sphere centered on it, and the cloud lingers for 1 minute. Any flesh-and-blood creature in the cloud when it appears, or that enters it later, must make a DC 12 Constitution saving throw. On a successful save, the creature can't be infected by these spores for 24 hours. On a failed save, the creature is infected with a disease called the spores of Zuggtmoy and also gains a random form of indefinite madness (determined by rolling on the Madness of Zuggtmoy table in appendix D) that lasts until the creature is cured of the disease or dies. While infected in this way, the creature can't be reinfected, and it must be repeat the saving throw at the end of every 24 hours, ending the infection on a success. On a failure, the infected creature's body is slowly taken over by fungal growth, and after three such failed saves, the creature dies and is reanimated as a spore servant if it's a type of creature that can be (see the "Myconids" entry in the Monster Manual).

Corpse Burst. Gore, offal, and acid erupt from a corpse within 20 feet of Yestabrod. Creatures within 10 feet of the corpse must succeed on a DC 12 Dexterity saving throw or take 7 (2d6) acid damage.

Foul Absorption. Yestabrod absorbs putrescence from a corpse within 5 feet of it, regaining 1d8 + 2 hit points