I hope you enjoy the dihydrogen monoxide swarm, and I'll see you next week with another monster!
Can you find all the swarms in this image?
This densely packed swarm
is translucent but presents a mirrorlike surface from certain angles.
Dihydrogen Monoxide
Swarm CR 1/8
XP 50
N Fine construct (swarm)
Init –5; Senses darkvision 60 ft., low-light
vision; Perception –5
DEFENSE
AC 13, touch 13,
flat-footed 13 (–5 Dex, +8 size)
hp 5 (1d10)
Fort +0, Ref –5, Will –5
Defensive Abilities
swarm traits; Immune construct
traits, acid, cold, electricity
Weaknesses
vulnerability to fire
OFFENSE
Speed 0 ft.;
immobile
Melee swarm (1
plus choking hazard and distraction)
Space 10 ft.; Reach 0 ft.
Special Attacks
distraction (DC 10), drown, flame killer, inexorability, scalding retribution
STATISTICS
Str 1, Dex 1, Con —, Int —, Wis 1, Cha 2
Base Atk +1; CMB —; CMD —
SQ camouflage
ECOLOGY
Environment any
Organization
solitary or collective (2–10,000)
Treasure
incidental
SPECIAL ABILITIES
Camouflage (Ex)
Since a dihydrogen monoxide swarm looks like ordinary water when at rest, a successful
DC 10 Perception check is required to notice it before it attacks for the first
time. Anyone with ranks in Survival, Knowledge (nature), or Craft (alchemy) can
use any of those skills instead of Perception to notice the swarm.
Choking Hazard (Ex)
If a dihydrogen monoxide swarm enters a square with a creature that needs to
breathe, the creature must succeed at a DC 5 Reflex save or become sickened for
1d4 rounds.
Drown (Ex) A
creature caught in a dihydrogen monoxide swarm for consecutive rounds is at risk
for drowning.
Flame Killer (Ex)
While a dihydrogen monoxide swarm takes extra damage from magical and alchemical
fire that affects an area, it can affect nonmagical sources of flame. If it
enters a square with an unprotected, nonmagical fire, the fire must succeed on
a DC 5 Reflex save or be extinguished.
Immobile (Ex) A
dihydrogen monoxide swarm requires another creature to act on it for it to
move. If placed in a container, the swarm can be thrown with a 20-foot range
increment. Alternatively, the swarm can hide among a downpour and as it falls;
the swarm takes no falling damage from this.
Inexorability (Ex)
While at rest, a dihydrogen monoxide swarm still deals 1d6 points of damage per
year to creatures or objects in constant contact with the swarm. This damage
bypasses hardness.
Scalding Retribution (Ex) If a dihydrogen monoxide swarm dies by taking fire damage, it transforms into a gas dihydrogen monoxide swarm for 1 round. It immediately deals 1d6 points of fire damage to creatures in its space, and deals 1d6 points of fire damage to creatures entering its space. At the end of its next turn it dissipates.
Scalding Retribution (Ex) If a dihydrogen monoxide swarm dies by taking fire damage, it transforms into a gas dihydrogen monoxide swarm for 1 round. It immediately deals 1d6 points of fire damage to creatures in its space, and deals 1d6 points of fire damage to creatures entering its space. At the end of its next turn it dissipates.
Sometimes the scariest monsters are those that seem the most
innocuous. Such is the case with dihydrogen monoxide swarms, which appear to
the untrained eye as nothing more than typical water. In fact, the creatures
often lay in wait for unsuspecting prey to submerge themselves into water
containing them, where they can strike and infiltrate their targets’ lungs.
Even more terrifying, dihydrogen monoxide swarms left unattended devastate flesh
and objects over time.
As they are usually immobile (except in rare occasions when
they attack from the sky), they must rely on allies to generate their
devastating attacks. They are often befriended by aquatic creatures and elementals
from the Plane of Water. The swarms have no concept of the world around them
and are content to remain inert, provided they stay out of heat sources for
prolonged periods.
Variant Dihydrogen Monoxide
Swarms
The most typical encounter with dihydrogen monoxide swarms occurs
with the creatures in liquid form. However, they can assume a solid shape in
extreme cold conditions and a gaseous form in extreme heat.
Ice Dihydrogen
Monoxide Swarm: Gains a +2 natural armor bonus to AC and deals 1d4 points
of damage with its swarm attack. Loses its choking hazard, drown, and flame
killer abilities. If an ice dihydrogen monoxide swarm takes fire damage, it
reverts to its liquid form.
Gas Dihydrogen Monoxide
Swarm: Gains immunity to fire and deals 1d4 points of fire damage with its swarm
attacks. Loses immunity to cold and its drown ability. Strong wind (natural or
magical) automatically destroys a gas dihydrogen monoxide swarm. If the swarm
takes cold damage, it reverts to its liquid form.