Icy-Bob (5e Creature)
From D&D Wiki
Medium humanoid (Human), lawfull neutral
Nearly Cold Immune. Bob has advantage on saving throws against effects that deal cold damage or are caused by cold and he is immune to effects of exstreme cold all the way down to -85°C/-121°F. If Bob would take cold damage he may reduce the damage by 6d6+4.
Brute. A melee weapon deals one extra die of damage of it's type of damage when Bob hits with it (included in the attack).
Multiattack. Bob makes 3 melee attacks
Bob is a large human about 7 1/2 feet high who has been made so that he can withstand even the most extreme cold.