Sources
CR
Type
Size
Alignment
Movement

Serapio

Medium Fiend (demon), Neutral Evil

Armor Class 13
Hit Points 78 (12d8 + 24)
Speed 30 ft., fly 30 ft.
STR
12
+1
DEX
17
+3
CON
14
+2
INT
10
+0
WIS
15
+2
CHA
10
+0
Saving Throws DEX +6, CON +5
Skills Perception +5, Stealth +6
Damage Resistances cold, poison
Condition Immunities Poisoned
Senses darkvision 120 ft., passive Perception 15
Languages Abyssal, Common
Challenge 5 (1,800 XP)

Traits

Magic Resistance. Serapio has advantage on saving throws against spells and other magical effects.

Actions

Multiattack. Serapio makes two Talon attacks.

Talon. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit:8 (1d8 + 3) piercing damage plus 14 (3d8) poison damage.

Change Shape. Serapio magically transforms into a Medium owl, while retaining its game statistics (other than its size). This transformation ends if the tlacatecolo is reduced to 0 hit points or if it uses its action to end it.

Plague Winds (Fiend Form Only; Recharge 5-6). Serapio emits a chilling, disease-ridden wind in a 60-foot line that is 10 feet wide. Each creature in that area must succeed on a DC 13 Constitution saving throw or take 26 (4d12) cold damage and become poisoned.

While poisoned in this way, the creature can't regain hit points. At the end of every hour, the creature must succeed on a DC 13 Constitution saving throw or gain 1 level of exhaustion. If the creature is in direct sunlight when it makes this saving throw, it automatically succeeds on the save.

If the creature is targeted by magic that ends a poison or disease, such as lesser restoration, while the creature isn't in direct sunlight, the effect does not end.