Runeswarm

Runeswarm is a large construct (Challenge Rating 10).

Runeswarm — fantasy monster illustration. Runeswarm is a large construct (Challenge Rating 10).
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AC: 15

HP: 150

Speed: fly 60 ft., walk 0 ft.

STR: 3

DEX: 20

CON: 15

INT: 2

WIS: 12

CHA: 18

A cloud of inky runes churns as some of the markings illuminate briefly._
Untended Runes. Runes that have gone unused for years or those created on ley lines sometimes gain a modicum of sentience and coalesce into a gestalt known as a runeswarm. The mix of runes flits about in random directions and remains inert except when it encounters living beings.
Early Warning. Runeswarms trigger their rune randomly, but the runes creating an effect light up moments before the swarms invoke the runes, giving canny observers the chance to prepare for the runeswarms’ effects.

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022
Last updated 7/27/2026·Tags: monster, construct, large