Frost Giant Everlasting One

Huge giant (frost giant), chaotic evil
Armor Class 15 (patchwork armor)
Hit Points 189 (14d12 + 98)
Speed 40 ft.
STR
25 (+7)
DEX
9 (-1)
CON
24 (+7)
INT
9 (-1)
WIS
10 (+0)
CHA
12 (+1)
Saving Throws Str +11, Con +11, Wis +4
Skills Athletics +11, Perception +4
Damage Immunities cold
Senses darkvision 60 ft., passive Perception 14
Languages Giant
Challenge 12 (8400 XP)

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

Some frustrated frost giant worship Vaprak, the deity of trolls and ogres, to gain its favor and be transformed into an everlasting one, a giant with enough strength to rival the leader of a clan.
Volo´s Guide to Monsters
Frost Giant Everlasting One