Kassoon

This is homebrew, submitted by a member of the community.

Rat King

Rat King

Medium monstrosity, chaotic evilMedium monstrosity, chaotic evil
Armor Class 1414
[~<13]
+/-/*
Hit Points 76 (9d8+36)76 (9d8+36)
[~1-6]
Speed 30 ft.
20 ft. Burrow
30 ft.
20 ft. Burrow

STR
6 (-2)
DEX
16 (+3)
CON
18 (+4)
INT
11 (+0)
WIS
15 (+2)
CHA
16 (+3)

Token URL:
Saving Throws - -
Skills -stealth +6 -stealth +6
Damage Vulnerabilities
Damage Resistances bludgeoning, piercing, and slashing from nonmagical attacks
Damage Immunities -poison
Condition Immunities -charmed, frightened, paralyzed, petrified, poisoned, prone, stunned -charmed, frightened, paralyzed, petrified, poisoned, prone, stunned
Senses darkvision 60 ft., passive Perception 12darkvision 60 ft., passive Perception 12
Languages Common, thieves cantCommon, thieves cant
PB +3
Challenge 5 (1,800 XP)

[+instructions]

SPECIAL TRAITS

Keen Smell. The rat king has advantage on Wisdom (Perception) checks that rely on smell.
Plague of Ill Omen. The rat king radiates a magical aura of misfortune. A creature that starts its turn within 15 feet of the rat king must succeed on a DC 14 Charisma saving throw or have disadvantage on attack rolls and saving throws until the start of its next turn.

SPECIAL TRAITS

Keen Smell. The rat king has advantage on Wisdom (Perception) checks that rely on smell.
Plague of Ill Omen. The rat king radiates a magical aura of misfortune. A creature that starts its turn within 15 feet of the rat king must succeed on a DC 14 Charisma saving throw or have disadvantage on attack rolls and saving throws until the start of its next turn.

Actions

[~Hit +2, DC <13, DPR 0-1]

Multiattack. The rat king makes two Bite attacks.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d6+3) piercing damage plus 7 (2d6) poison damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or suffer one level of exhaustion and become infected with a disease. Until the disease is cured, at the end of each long rest, the creature must repeat the saving throw. On a failure, the creature suffers another level of exhaustion. The exhaustion lasts until the creature finishes a long rest after the disease is cured. A creature that succeeds on two saving throws recovers from the disease.
Call Rats (1/Day). The rat king magically calls 2d4 rats, 1d4 giant rats, or 1 swarm of rats. The rates arrive in 1d4 rounds, acting as allies of the rat king and obeying its spoken commands. The rats remain for 1 hour, until the rat king dies, or until the rat king dismisses them as a bonus action.

Multiattack. The rat king makes two Bite attacks.
Bite. Melee Weapon Attack: [+6] to hit, reach 5 ft., one target. Hit: 10 ([2d6+3]) piercing damage plus 7 ([2d6]) poison damage. If the target is a creature, it must succeed on a DC 14 Constitution saving throw or suffer one level of exhaustion and become infected with a disease. Until the disease is cured, at the end of each long rest, the creature must repeat the saving throw. On a failure, the creature suffers another level of exhaustion. The exhaustion lasts until the creature finishes a long rest after the disease is cured. A creature that succeeds on two saving throws recovers from the disease.
Call Rats (1/Day). The rat king magically calls [2d4] rats, [1d4] giant rats, or 1 swarm of rats. The rates arrive in [1d4] rounds, acting as allies of the rat king and obeying its spoken commands. The rats remain for 1 hour, until the rat king dies, or until the rat king dismisses them as a bonus action.

Legendary Actions

REACTIONS

Absorption. When a friendly rat, giant rat, or swarm of rats starts its turn within 5 feet of the rat king, the rat king can absorb it. If the rat king does so, the target dies, and the rat king gains temporary hp equal to the target’s remaining hp.

REACTIONS

Absorption. When a friendly rat, giant rat, or swarm of rats starts its turn within 5 feet of the rat king, the rat king can absorb it. If the rat king does so, the target dies, and the rat king gains temporary hp equal to the target’s remaining hp.
 

Details

A great knot of scabrous rats scrabbles together as a mass, with skulls, bones, and flesh entangled in the whole.

Teeth, eyes, and fur all flow as a single disturbing rat swarm walking on two legs.

Fused at the Tail. A rat king forms when dozens of rats twist their tails together in a thick knot of bone and lumpy cartilage—and offer praise to the rat demon Chittr’k’k. Its numbers and powers grow quickly.

Rule Sewers and Slums. The rat king is a cunning creature that stalks city sewers, boneyards, and slums. Some even command entire thieves’ guilds or hordes of beggars that give it obeisance. They grow larger and more powerful over time until discovered.

Plague and Dark Magic. The rat king is the result of plague infused with twisted magic, and a malignant ceremony that creates one is called “Enthroning the Rat King.” Rats afflicted with virulent leavings of dark magic rites or twisted experiments become bound to one another. As more rats add to the mass, the creature’s intelligence and force of will grow.

A great knot of scabrous rats scrabbles together as a mass, with skulls, bones, and flesh entangled in the whole.

Teeth, eyes, and fur all flow as a single disturbing rat swarm walking on two legs.

Fused at the Tail. A rat king forms when dozens of rats twist their tails together in a thick knot of bone and lumpy cartilage—and offer praise to the rat demon Chittr’k’k. Its numbers and powers grow quickly.

Rule Sewers and Slums. The rat king is a cunning creature that stalks city sewers, boneyards, and slums. Some even command entire thieves’ guilds or hordes of beggars that give it obeisance. They grow larger and more powerful over time until discovered.

Plague and Dark Magic. The rat king is the result of plague infused with twisted magic, and a malignant ceremony that creates one is called “Enthroning the Rat King.” Rats afflicted with virulent leavings of dark magic rites or twisted experiments become bound to one another. As more rats add to the mass, the creature’s intelligence and force of will grow.
 
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Monster Statistics by Challenge Rating

CRProf. BonusACHPAttack BonusDamage / RoundSave DC
0+2<131-6<+30-1<13
1/8+2137-35+32-313
1/4+21336-49+34-513
1/2+21350-70+36-813
1+21371-85+39-1413
2+21386-100+315-2013
3+213101-115+421-2613
4+214116-130+527-3214
5+315131-145+633-3815
6+315146-160+639-4415
7+315161-175+645-5015
8+316176-190+751-5616
9+416191-205+757-6216
10+417206-220+763-6816
11+417221-235+869-7417
12+417236-250+875-8017
13+518251-265+881-8618
14+518266-280+887-9218
15+518281-295+893-9818
16+518296-310+999-10418
17+619311-325+10105-11019
18+619326-340+10111-11619
19+619341-355+10117-12219
20+619356-400+10123-14019
21+719401-445+11141-15820
22+719446-490+11159-17620
23+719491-535+11177-19420
24+719536-580+12195-21221
25+819581-625+12213-23021
26+819626-670+12231-24821
27+819671-715+13249-26622
28+819716-760+13267-28422
29+919761-805+13285-30222
30+919806-850+14303-32023

Damage Severity by Level

LevelSetbackDangerousDeadly
1-41d102d104d10
5-102d104d1010d10
11-164d1010d1018d10
17-2010d1018d1024d10

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