Large aberration, lawful evil
Armor Class 14 (natural armor)
Hit Points 130 (20d10 + 20)
Speed 10 ft., fly 20 ft., swim 40 ft.
Saving Throws Dex +4
Damage Resistances psychic
Condition Immunities frightened, prone
Senses , blindsight 30 ft.,passive Perception 11
Languages Deep Speech (cannot speak), telepathy 30 ft.
Challenge 4 (1,100 XP)
Aberrant Physiology. The slithering crown has no mouth, instead absorbing all of its sustenance through its skin. It can breathe air and water. It has disadvantage on saving throws against gaseous or cloud-based effects, as it cannot hold its breath.
Many Minds. The slithering crown has a composite mind made of multiple slitherwhites. It has advantage on saving throws to resist being charmed.
Alien Insights. A slithering crown can cast contact other plane. Once used, it regains the ability to do so after one week.
Constrict. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 12 (2d8 + 3) bludgeoning damage, and the target is grappled (escape DC 13). A creature that starts its turn grappled by a slithering crown must make a DC 13 Wisdom saving throw, suffering 13 (3d8) radiant damage and becoming frightened on a failed save. On a success, it suffers half damage and is not frightened.
The aboleths send huge numbers of slitherwhites into the incomprehensible realms beyond our world, to bring back what they can or to feed the formless intelligences that dwell there. One time in a thousand, a slitherwhite survives and returns to the Material Plane, having merged with other slitherwhites to form a loosely woven circle of wriggling, whitish flesh. In the center of that ring, there burns a point of light that is unbearable to look upon—a scintilla of malicious radiance.
Dire Oracles. The minds of the slitherwhites merge into a keen intellect, shaped by realms where time, space, and causality have little meaning. The aboleths value the combat potential of slithering crowns, but far more, they value their oracular insight into the past, the present, and possible futures. When doing so does not contradict orders from their masters, or when conjured by a humanoid spellcaster, slithering crowns can be propitiated with offerings of prophetic verses, pearls, and fire coral of the highest quality. They bargain with surprising honesty for their assistance, but the cost for their extraplanar insight is steep.