Sources
CR
Type
Size
Alignment
Movement

Killmoulis

Tiny Fey, Neutral

Armor Class 14
Hit Points 7 (2d4 + 2)
Speed 30 ft., climb 30 ft.
STR
4
-3
DEX
19
+4
CON
13
+1
INT
12
+1
WIS
14
+2
CHA
13
+1
Skills History +3, Perception +4, Stealth +8
Senses darkvision 30 ft., passive Perception 14
Languages Common, Sylvan, telepathy 60 ft.
Challenge 0 (10 XP)

Actions

Slam. Melee Weapon Attack: +-1 to hit, reach 5 ft., one target. Hit:1 bludgeoning damage.

Blessing of Bountiful Generosity (1/Day). The killmoulis targets up to eight creatures within 100 feet of it that it can see. The next time a target finishes a long rest, it regains all spent Hit Dice and gains 10 temporary hit points.

Curse of Poor Hospitality (1/Day). The killmoulis targets up to eight creatures within 100 feet of it that it can see. The next time a target completes a long rest, it does not regain spent Hit Dice.

Lore

A killmoulis can be either a bane or boon to an adventuring party. When kept well fed with tasty treats, this creature is a helpful assistant that mends armor, collects herbs that make the blandest rations into a feast, and turns a dull, uncomfortable campsite into a welcoming refuge. But if a party abuses or neglects a killmoulis, the creature's mean-spirited thirst for revenge can turn even the simplest expedition into a draining ordeal that leaves adventurers tired, dispirited, and sullen.