Blistered Soul

Corrupt Positive Energy Aura. Any creature that starts its turn within 30 feet
of the blistered soul takes 7 (2d6) radiant damage. An undead creature
instead takes 14 (4d6) damage and suffers disadvantage on all saving
throws until the end of its next turn.

Magic Resistance. The blistered soul has advantage on saving throws
against spells and other magical effects.

Positive Energy Corruption. When the blistered soul deals damage to a
creature, the creature must succeed on a DC 14 Constitution saving
throw or suffer one level of positive energy corruption.

Revert to Spore. As a last-ditch defense, the blistered soul can use its
bonus action to rejoin the worldskin by forming a spawning spore. The
new spore appears in the blistered soul's former position. It is considered
expended and must be fully regenerated before it can be activated.
Casting dispel magic on the spore within 3 rounds of transformation
destroys it and returns the blistered soul to the surface. The blistered soul
retains any damage and ongoing conditions from before it attempted to
revert.

Unyielding Essence. The blistered soul is immune to any spell or effect that
would alter its form, as well as those that would read its thoughts,
determine if it is lying, or magically influence its thoughts or behavior.

Multiattack. The blistered soul makes two claw attacks.

Claw. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 12
(2d6 + 5) slashing damage plus 4 (1d8) radiant damage.

Tumor. Ranged Weapon Attack: +5 to hit, range 40/80 ft., one creature.
Hit: 12 (5d4) poison damage plus 4 (1d8) radiant damage. The target
must succeed on a DC 14 Constitution saving throw or be poisoned for 1
minute. The poisoned target can repeat the saving throw at the end of
each of its turns, ending the effect on a success.

Regenerate Worldskin. The blistered soul regenerates a worldskin feature
within 100 feet of it.

Skincasting. The blistered soul activates a worldskin feature within 100
feet of it.