Large Construct, Typically Neutral
Armor Class 14 (natural armor)
Hit Points 110 (13d10 + 39)
Speed 0 ft., fly 60 ft. (hover)
STR
1 (-5)
DEX
13 (+1)
CON
16 (+3)
INT
18 (+4)
WIS
18 (+4)
CHA
11 (+0)
Skills Perception +8
Senses Blindsight 360 ft. (blind beyond this radius), Passive Perception 18
Languages --
Challenge 9 (5,000 XP)
Proficiency Bonus +4
Traits

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

Scrying Focus. A spellcaster can use the fractine as a substitute focus when casting the scrying spell or similar magic, provided the spellcaster and the fractine are within 5 feet of each other.

Two-Dimensionality. The fractine can occupy another creature’s space and vice versa. It can move through other creatures and objects as if they were difficult terrain, but it takes 5 (1d10) force damage if it ends its turn inside an object.

Unusual Nature. The fractine doesn’t require air, drink, or sleep.

Actions

Extradimensional Touch. Melee Spell Attack: +5 to hit, reach 5 ft., one target. Hit: 24 (8d6) force damage.

Bonus Actions

Imprison. The fractine targets one creature of its size or smaller in its space. The target must succeed on a DC 16 Dexterity saving throw or be imprisoned in a demiplane. While the creature is imprisoned, a distorted image of it can be seen on the fractine’s two-dimensional surface.

The demiplane moves with the fractine, has indestructible and opaque walls, and is only as big as it needs to be to contain the target, which doesn’t suffer from hunger or thirst while imprisoned. No other creature can enter the demiplane, and the fractine can’t be harmed from within the demiplane.

The fractine can imprison only one creature at a time and can release that creature as a bonus action. If the fractine is reduced to 0 hit points, any creature in the fractine’s demiplane is released instantly. A released creature reappears in an unoccupied space as close to the fractine (or where it died) as possible. A creature can leave the demiplane on its own by using magic that enables planar travel, such as the plane shift spell.

Reactions

Mirrored Damage. In response to being damaged by a creature it can see within 120 feet of itself, the fractine forces that creature to make a DC 16 Constitution saving throw. On a failed save, the creature takes 24 (8d6) force damage. On a successful save, the creature takes half as much damage.

Split. When a Large fractine that has at least 10 hit points remaining takes bludgeoning, piercing, slashing, or thunder damage from any source, it splits into two Medium fractines. The new fractines occupy the space formerly occupied by the original fractine, and each new fractine has hit points equal to half the original’s, rounded down. If the original fractine had a creature trapped in its demiplane, that creature is released when the fractine splits, reappearing in an unoccupied space as close to the new fractines as possible.

Description

A fractine is a bizarre, two-dimensional creature that flies through Wildspace and the Astral Sea, folding and refolding like a piece of origami. When it encounters another creature, it flattens into a plane that resembles a trapezoidal mirror between 9 and 13 feet tall.

Astral explorers who have encountered fractines attest that the creatures are intelligent and often allow themselves to be used as scrying sensors, their reflective surfaces substituting for the mirror needed to cast certain divination spells. While being used in this way, the fractine siphons magical energy from the spellcaster—not enough to cause harm, but enough to make the caster take notice.

A fractine needs light and magical energy to survive. It can draw sustenance from a nearby light source, spellcaster, magic item, or magical effect without causing harm to anyone or anything. A fractine that doesn’t consume light or magical energy for ten days begins to flicker. A day later, it folds in on itself and self-destructs, leaving no trace of itself behind. The destruction of a fractine is accompanied by a loud sound reminiscent of shattering glass.

A fractine attacks by falling on its targets, dealing damage as it passes through them. A fractine can also imprison a creature inside a demiplane contained within its two-dimensional form, the prisoner’s distorted reflection visible in the fractine’s glassy surface.

Bludgeoning, piercing, slashing, and thunder damage can cause a fractine to break into two smaller fractines, each one autonomous and capable of imprisoning creatures. When a fractine dies, it folds in on itself and disappears, releasing any creature trapped inside it.

Monstrous Compendium Vol. 1: Spelljammer Creatures, pg. 7

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