Gorthir, Half Troll Half Demon, wields famous magical Hammer of the Underworld

Comes south from the Ozark mountains to the North by the Vfnir lands
Wields the Hammer of the Underworld
Has come about from the union of a Troll King and a Balor demon, creating a weird union.
Being a troll can regenerate, but with the demon it is resistant to fire and acid
Is a huge creature similar the size of a giant.
However, it is cunning and clever, and when nearly dead, it tricked its way into the underworld, knocked out Hades dog, and stole his famous hammer
AC 20,  HP 280, True sight, Speed 40, Fly 80, Passive Perc 25 Str 26 +8 Dex 22 +6 Con 24 +7 Int 22 +6 Wis 18 +4 Cha 24 +7 ST Str +14, Dex +10, Con +13, Int +6, Wis +10, Chr +13 Death throes Fire Aura 5 feet 3d6 damage Magic resistance - Advantage Regenerate as a troll +10Hp per turn Invisibility Ring Actions Invisibility Teleport 120 feet Attack with Hammer +3, does 3d8 fire damage, 3d8+8 crushing, +14 to hit x2 Can shape change and do illusions. Spell save 18 Skills,  Pick lock, Sneak, Disable trap, Investigation
Innate spell casting; At will, Detect magic, major image,  Dispel magic, Fear, Telekiness Knock, Silence, Darkness, mage hand Find item
Legendary Actions; Shape change Invisibility Disengage
Now has a brood of Kids, Cambrions, sneaky, have rings of illusion for shape changing, and have troll blood so can regenerate, from one of Hades nymphs...