Interstice, the Between-Count

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Medium Aberration, Neutral Evil

Armor Class 15 (natural armor)

Hit Points 117 (18d8+36)

Speed 30 ft.

STR 16 (+3)

DEX 14 (+2)

CON 14 (+2)

INT 10 (+0)

WIS 12 (+1)

CHA 8 (-1)

Saving Throws Con +5, Wis +4

Skills Stealth +6, Perception +4

Condition Immunities charmed, frightened

Senses darkvision 60 ft., passive Perception 14

Languages Common

Challenge 6 (2,300 XP) Proficiency Bonus +3

Temporal Veil. The Interstice is intangible and elusive while existing in the moments between initiative counts. It can move through creatures and objects as if they were difficult terrain and remains invisible when not attacking.

Incorporeal Step. The creature can shift between corporeal and ethereal forms as a bonus action, allowing it to pass through creatures and foes. While ethereal, it resists nonmagical weapon damage.

Time Echo. Creatures within 10 feet that can see the Interstice have disadvantage on attack rolls against it for the first turn after it uses a reaction.

Actions

Multiattack. The Interstice makes three attacks: a Bite, a Claw, and a Tail.

Bite. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10+4) piercing damage.

Claw. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6+4) slashing damage.

Tail. Melee weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 13 (2d8+4) bludgeoning damage. If the target is Medium or smaller, it must succeed on a DC 15 Strength saving throw or be knocked prone.

Bonus Actions

Vanish into the Gap. The Interstice turns intangible and invisible until the start of its next turn. While intangible, it can move through creatures and objects.

Reactions

Moment's Pause. Melee weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 6 (1d6+3) slashing damage. When a creature within 5 feet finishes its turn, the Interstice can strike at the end of its momentary pause.

Environment Underdark

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Lore & Description

Appearance

A thin, shifting silhouette of smoke and clockwork gears, the Interstice flickers in and out of existence. Its eyes are empty voids, and its body hums with the quiet tick of a clock that never reaches zero. It is never fully seen, and when it seems to be there, it is already gone again, occupying the micro-instant between initiative counts. It strikes with surgical timing, as if time itself were a weapon.

Behavior & Origins

This being emerges from the tremor between counts, a guardian of the moment when time seems to pause. Adventurers who race to act find that the Interstice knew their plan before they did, punishing those who rush or miscalculate. It feeds on deliberate choices made with too much haste; the more a party acts in a single breath, the more it is drawn to the breach in time.

Monster Image

Generation Info

Original prompt:
"A being that exists only between initiative counts."

Created: Feb 2, 2026
Modified: May 22, 2026