subtypes

Mandatory traits:  Any Frost subtype trait or subtype special weapon.

Special subtype traits: Ice Horns, Ice Limbs, Frost Breath, Ice Scales (Do not count into MYO traits limit)

Special Tail Weapons: Cryogun. (This doesn't mean other types of weapons can't be used. Legendary subtypes can use any weapon from lower rarity and even make it special looking based on subtype.)