Amorphous. Clathrus Adult can move through a space as narrow as 1 inch wide without squeezing. Clathrus Adult can eat through 2-inch-thick, nonmagical wood or metal in 1 round.
Corrosive Form. A creature that touches Clathrus Adult or hits it with a melee attack while within 5 feet of it takes 14 (3d8) acid damage. Any nonmagical weapon made of metal or wood that hits the Clathrus Adult corrodes. 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 metal or wood that hits Clathrus Adult is destroyed after dealing damage.
Innate Spellcasting. Clathrus Adult's spellcasting ability is Charisma (spell save DC 20, +12 to hit with spell attacks). Clathrus Adult can innately cast the following spells, requiring no material components:
At will: Acid Splash (17th level), Poison Spray (11th Level), Detect Magic, & Locate Animals or Plants
3/day each: Contagion, Gaseous Form, Dispel Magic, Ensnaring Strike, Entangle, & Plant Growth
Spider Climb. Clathrus Adult can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Legendary Resistance (3/Day). If Clathrus Adult fails a saving throw, it can choose to succeed instead.
Magic Resistance. Clathrus Adult has advantage on saving throws against spells and other magical effects.
Magic Weapons. Clathrus Adult's weapon attacks are magical.
Mycelium Regeneration. Clathrus Adult regains 15 hit points at the start of its turn. If it takes radiant damage, this trait doesn’t function at the start of its next turn. Clathrus Adult dies only if it starts its turn with 0 hit points and doesn’t regenerate.
Multiattack. Clathrus Adult makes 3 Pseudopod or 3 Spore Bolt attacks.
Pseudopod. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 20 (3d8 + 6) bludgeoning damage plus 14 (4d6) acid damage. In addition, the target must succeed on a DC 19 Strength saving throw or be pulled 10 feet toward Clathrus.
Spore Bolt. Ranged Weapon Attack: +12 to hit, reach 90 ft., one target. Hit: 27 (6d8) poison damage and the target is blinded until the start of its next turn.
Demonic Spores (Recharge 5–6). Clathrus Adult releases spores that burst out in a cloud that fills a 40-foot-radius sphere centered on it. Humanoids and beasts in the cloud must make a DC 20 Constitution saving throw taking 45 (10d8) poison damage on a failed save, or half as much on a success.
Ooze Surge. Clathrus moves up to 20 feet without provoking opportunity attacks. Creatures he moves through take 10 (3d6) acid damage.
Spore Puff. One creature within 20 feet must succeed on a DC 20 Constitution saving throw or be poisoned until the end of its next turn
Devour Essence. When Clathrus Adult hits a creature with a melee attack, the target must succeed on a DC 20 Constitution saving throw. On a failed save, the creature loses its highest available spell slot or one use of a class feature chosen by the DM until the end of its next long rest.
Corrosive Reprisal. When a creature hits Clathrus with a melee attack, it takes 10 (3d6) acid damage.
Spore Shield. When hit by an attack roll, Clathrus can use its reaction to impose disadvantage, potentially causing the attack to miss.
Clathrus Adult can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. Clathrus Adult regains spent legendary actions at the start of its turn.
Move. Clathrus Adult moves up to half his speed without provoking attacks of opportunity.
Acid Splash. Clathus Adult casts acid splash.
Corrupting Touch (Costs 2 Actions). Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 22 (3d8 + 8) poison damage, and the target is slimed. Until the slime is scraped off with an action, the target is poisoned, and any creature, other than an ooze, is poisoned while within 10 feet of the target.
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