Aberrant Ground. The ground in a 10-foot radius around the boil is doughlike difficult terrain. Each creature that starts its turn in that area must succeed on a DC 16 Strength saving throw or have its speed reduced to 0 until the start of its next turn.
Orbital Cysts. When combat is initiated, the boil has control over 3 orbital cyst that are able to move on their own. These cysts can be the source of the boil's spells, can be used for its Pseudopod attack, and share its hit point pool. If more than 15 damage is done on another creature's turn to a single cyst, then that cyst perishes, dealing an extra 1d10 + 6 psychic damage to the boil. On the boil's turn it can move each cyst up to 10 feet.
Spellcasting. The Boil has access to the following spells, which it can cast without expending spell slots. The spell save is DC 16.
1st level: shield
2nd level: blindness/deafness, levitate
3rd level: vampiric touch
4th level: polymorph*
*Polymorph can only be used on other creatures
Multiattack. The Boil makes two pseudopod attacks.
Pseudopod. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 17 (5d6) piercing damage. If the target is Medium or smaller, it must succeed on a DC 12 Strength saving throw or be knocked prone. If the target is killed by this damage, it is absorbed into the boil.
Conjure Cyst. A new cyst emerges from the boil's body, anywhere within 5 feet of either the boil or another cyst.
Frightful Presence: Each creature of the boil's choice that is within 120 feet of it and aware of it must succeed on a DC 14 Wisdom saving throw or become Frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, Ending the Effect on itself on a success. If a creature's saving throw is successful or the Effect ends for it, the creature is immune to the its Frightful Presence for the next 24 hours.
Spellcaster. The boil casts a spell of 3rd level or below. (2 actions)
Pop Cyst. One of the cysts pops. Any creature within a 10 foot radius of the chosen cyst must make a Dexterity saving throw. On a failed save, the creature takes 1d12 acid damage, or half as much on a successful one. Once a cyst is popped it is no longer usable, and foregoes the normal psychic damage that it would do to the boil upon defeat. (1 action)
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