Illustration Xan Drake

Rotsam Swarm

Tome of Beasts 2
Challenge 6
(2,300 XP)
Robinloft Estimated CR 5
Large ooze, unaligned
Armor Class 9
Hit Points 142 (15d10+60)
Speed 10 ft., swim 30 ft.
STR
19 (+4)
DEX
8 (-1)
CON
18 (+4)
INT
1 (-5)
WIS
9 (-1)
CHA
6 (-2)
Saving Throws
Skills
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities necrotic
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 9
Languages
Environments
Bog Rot.

A creature that fails its saving throw against the rotsam’s diseased bite attack becomes infected with the bog rot disease. Until the disease is cured, the infected creature’s skin breaks out in a rot-like rash that slowly spreads across its body, and its hp maximum decreases by 7 (2d6) for every 24 hours that elapse. After the first 24 hours, the creature’s skin starts to smell like rot, and creatures have advantage on Wisdom (Perception) and Wisdom (Survival) checks to find the infected creature. The reduction and rot smell last until the disease is cured. The creature dies if the disease reduces its hp maximum to 0.

Spider Climb.

The rotsam can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

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 rotsam. The swarm can’t regain hp or gain temporary hp.

Actions

Diseased Bites. Melee Weapon Attack: +7 to hit, reach 0 ft., one creature. Hit: 10 (4d4) piercing damage plus 21 (6d6) necrotic damage, or 5 (2d4) piercing damage and 10 (3d6) necrotic damage if the swarm has half of its hp or fewer. The target must make a DC 15 Constitution saving throw or contract a disease (see the Bog Rot trait).

Rotsam Swarm

Not yet described

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