5e SRD >Creatures >

Amalgamite Swarm

Large swarm of Tiny constructs, unaligned

Armor Class 15
Hit Points 84 (13d10 + 13)
Speed 30 ft.; climb 30 ft.

3 (-4) 20 (+5) 12 (+1) 6 (-2) 10 (0) 1 (-5)

Skills Stealth +7
Damage Resistances bludgeoning, piercing, slashing from nonmagical weapons that aren’t adamantine
Damage Immunities acid, poison, psychic
Condition Immunities charmed, exhaustion, frightened, paralyzed, petrified, prone, poisoned, restrained, stunned
Senses darkvision 60 ft., passive perception 10
Languages understands Common but can’t speak
Challenge 8 (3,900 XP)


  • Dispersion. The amalgamite swarm can disperse itself across a 30-foot cube over the course of 1 round. While dispersed, the swarm has advantage on Dexterity (Stealth) checks made to hide and can hide even if it is being observed. The dispersed swarm cannot attack, deal damage, or regain hit points or gain temporary hit points. The swarm can reform over the course of 1 minute, but it loses its advantage on Dexterity (Stealth) checks while reforming.
  • Reassemble. The amalgamite swarm regains 10 hit points at the start of its turn. If the swarm takes damage from a weapon or an effect that affects an area, this trait doesn’t function at the start of the swarm’s next turn. The swarm dies only if it starts its turn with 0 hit points and doesn’t reassemble.
  • Scuttling Swarm. The swarm can occupy another creature’s space and vice versa, and the swarm can move through any opening large enough for a Tiny amalgamite. The swarm can use its speed to move Medium-sized segments of its area independently from the rest of its area, as long as all segments remain contiguous.


  • Multiattack. The amalgamite swarm makes two attacks: one with its acid spit and one with its bite.
  • Acid Spit. Ranged Weapon Attack: +8 to hit, range 15/30 ft., one target. Hit: 21 (6d6) acid damage.
  • Bite.. Melee Weapon Attack: +8 to hit, reach 0 ft., one target in the swarm’s space. Hit: 25 (10d4) piercing damage, or 12 (5d4) piercing damage if the swarm has half of its hit points or fewer.


Originally forged as a self-replicating tool by a now-extinct race of artificers, these tiny animated machines were subverted by the Hegemony, used to destroy their creators, and then utilized by the Ultari as a weapon of conquest. By itself, each individual amalgamite component has sentience but little more. However, when they bring themselves together to form into insect-like amalgamite units, a hive-like consciousness forms. Amalgamites are inextricably bound to follow their programmed commands but they have the capacity to learn and are often quite cunning in how they follow out their orders.

Metal Destroyers. Amalgamites use their acidic spittle to break down small qualities of common minerals for energy to sustain themselves. They can also rapidly self repair damaged or broken components, but this requires considerably more energy. The process of creating amalgamites is complex and closely guarded secret, but amalgamites can replicate by themselves. This requires qualities of refined metal imbued with significant amounts of magical energy. Due to the potential danger of amalgamites reproducing out of control and destroying their owner’s valuables, amalgamites routinely have strict safeguards integrated into them that limit the total amount of units in a swarm.

Section 15: Copyright Notice
Legendary Planet Adventure Path (5E) © 2020, Legendary Games; Authors: Matt Goodall, Jim Groves, Steven T. Helt, Tim Hitchcock, Jason Nelson, Richard Pett, Tom Phillips, Mike Shel, Neil Spicer, Mike D. Welham