Frostjack 2014

CR 10 fey

Medium fey, neutral evil

Armor Class: 17 (natural armor)
Hit Points: 135 (18d8+54)
Speed: 30 ft.

STR15 (+2)

DEX18 (+4)

CON16 (+3)

INT11 (+0)

WIS17 (+3)

CHA13 (+1)

Saving Throws: Constitution +7, Charisma +5
Skills: Perception +3
Resistances: B/P/S damage from nonmagical attacks not made w/cold iron weapons
Damage Immunities: cold
Condition Immunities: exhaustion
Senses: darkvision 60 ft., passive Perception 17
Languages: Common, Elvish, Giant, Sylvan
Challenge: 10 (5,900 XP) · Proficiency Bonus +4

Chilling Presence.

At the start of each of its turns each creature within 15 ft. of it: 5 (2d4) cold (DC 16 Con negates). For each min a creature spends within 15 ft. of it: suffer one level of exhaustion from cold exposure (DC 16 Con negates). Unprotected nonmagical flames within 15 ft. of it are extinguished. Any spells of 3rd level or lower that provide resistance to cold and that are within 15 ft. of it immediately end. Water freezes if it remains within 15 ft. of it for at least 1 min.

Ice Walk.

Move across and climb icy surfaces with o ability check. Difficult terrain composed of ice or snow doesn't cost it extra move.

Magic Resistance.

Advantage: spell/magic effect saves.

Reactions

Hoarfrost Warding (3/Day).

When it takes fire it gains resistance to fire including triggering attack until end of its next turn.

Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details