Damage Transfer. While it is grappling a creature, the luminous mold takes only half the damage dealt to it, and the creature grappled by the luminous mold takes the other half.

Decay Wood & Metal. Any nonmagical weapon made of wood or metal that hits the luminous mold decays. After dealing damage, the weapon takes a permanent and cumulative −1 penalty to damage rolls. If its penalty drops to −5, the weapon is destroyed. Nonmagical ammunition made of wood or metal that hits the luminous mold is destroyed after dealing damage.

False Appearance. While the luminous mold remains motionless, it is indistinguishable from an ordinary mold cluster.

Multiattack. The luminous mold makes 1d3 Rotting Serenade attacks.

Pseudopodium. Melee Weapon Attack: +5 to hit, reach 5 ft., one Medium or smaller creature. Hit: 4 (1d6 + 1) bludgeoning damage plus 7 (2d6) acid damage, and if the target is wearing nonmagical (clothing,) leather or metal armor, its armor is partly decayed and takes a permanent and cumulative −1 penalty to the AC it offers. The armor is destroyed if the penalty reduces its AC to 10. (Clothing is destroyed instantly if it has no AC score to lower) The creature is grappled (escape DC 11). Until this grapple ends, the target is restrained, blinded, and the luminous mold can't pseudopodium another target. In addition, at the start of each of the target's turns, the target takes 2 (1d6 + 1) bludgeoning damage plus 3 (1d6 + 2) acid damage then tacks another permanent and cumulative −1 penalty to its armor AC. (If the target has no armor then one of the wielded weapon tacks the −1 penalty to its damage rolls that is also permanent and cumulative)

Rotting Serenade. Ranged Weapon Attack: +3 to hit, reach 15 ft., one creature. Hit: 4 (1d8 + 2) necrotic damage.

Spore Cloud. When fire or a creature is within 25 feet of the luminous mold, it emits a gas. The luminous mold continues to spew until the disturbance moves out of range and for 1d2 of the luminous mold's turns afterward. Adding 5 feet per turns to the fog. While it is grappling a creature or moving closer to attack luminous mold can't use spore cloud.

It create a 15-foot-radius sphere of poisonous, yellow-green fog centered around it. The fog spreads around corners. It lasts for the duration or until strong wind disperses the fog, ending the gas. Its area is heavily obscured.

When a creature enters the gas's area for the first time on a turn or starts its turn there, that creature must make a Constitution saving throw. The creature takes 1d6 + 1 poison damage on a failed save, or half as much damage on a successful one. Creatures are affected even if they hold their breath or don't need to breathe.

The gas moves 10 feet away from were it started at the start of each of the luminous Mold's turns, rolling along the surface of the ground. The spores, being heavier than air, sink to the lowest level of the land, even pouring down openings.