Bheur Hag (5.5)

Medium Fey, Typically Chaotic Evil
Armor Class 17 (natural armor)
Hit Points 91 (14d8 + 28)
Speed 30 ft., fly 50 ft. (hover, Graystaff magic)
STR
13 (+1)
DEX
16 (+3)
CON
14 (+2)
INT
12 (+1)
WIS
13 (+1)
CHA
16 (+3)
Saving Throws Wis +4
Skills Nature +4, Perception +4, Stealth +6, Survival +4
Damage Immunities cold
Senses darkvision 60 ft., passive Perception 14
Languages Auran, Common, Giant
Challenge 7 (2900 XP)     Proficiency Bonus +3
Control Weather (1/Day).
Graystaff Magic.
Ice Walk.
ACTIONS
Multiattack.
Slam.
Frost Shard.
Horrific Feast.
Spellcasting.

This full creature's stat block is not available (not OGL).

Bheur hags become more active during winter, using their ice and weather magic to make life miserable for nearby settlements. A bheur hag carries a twisted gray wooden staff that can be ridden like a flying broom and that augments the hag's magic.
Monsters of the Multiverse
Bheur Hag (5.5)