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Swarm of Esteron

Medium swarm of Tiny beasts, unaligned

Armor Class 13
Hit Points 54 (12d8)
Speed 10 ft., fly 30 ft., swim 30 ft.

10 (+0) 16 (+3) 10 (+0) 2 (-4) 12 (+1) 4 (-3)

Damage Resistances bludgeoning, piercing, slashing
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses darkvision 60 ft., passive Perception 11
Challenge 2 (450 XP)

Special Traits

  • Amphibious. The swarm can breathe air and water.
  • Keen Smell. The swarm has advantage on Wisdom (Perception) checks that rely on smell.
  • 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 esteron. The swarm can’t regain hit points or gain temporary hit points.


  • Bites. Melee Weapon Attack: +5 to hit, reach 0 ft., one creature in the swarm’s space. Hit: 14 (4d6) piercing damage, or 7 (2d6) piercing damage if the swarm has half its hp or fewer.


The cloud of flying amphibians is made up of individuals with heads and bodies that resemble those of a newt. Their skin is an oily black with bright blue markings along their spines, legs, and wings.

Territorial. Esteron are small, winged salamanders that live in large groups. They cluster around subterranean bodies of water and aggressively protect such places. Some underground creatures see the esteron as a delicacy, but those who hunt esteron know the beasts are quick to form swarms that can easily overwhelm an unprepared hunter.

Excellent Memory. Although esteron are not intelligent, they have extraordinary memories. Many underground peoples collect esteron in small groups and use the beasts to race through mazes in games of chance. Others who dwell underground sometimes gather esteron and teach them certain scents to help locate ores or to detect dangerous substances such as poison in food or hidden patches of mold or fungi.

Community Groups. Esteron are highly sociable creatures. They choose a mate for life, and both parents take turns caring for their young. When a young esteron finds itself orphaned, others within the larger community provide for it. Esteron communities are not lorded over by a dominant member. Instead, they cooperate with one another peacefully. When two groups of esteron encounter one another, they behave peacefully if the nearby water and food is abundant, sometimes even exchanging members. If resources are scarce, however, the group that inhabits the source of water drives away the outsider group with as little violence as possible.

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