Frostbitten Draugr

Medium undead, any evil alignment
AC: 13 (Armor Scraps) HP: 32 Speed: 30 ft.
STR 12(+1) DEX 14(+2) CON 15(+2) INT 6(-2) WIS 8(-1) CHA 5(-3)
Damage Vulnerabilities: Fire
Damage Immunities: Cold, Poison
Condition Immunities: Charmed, Exhausted, Poisoned
Senses: Darkvision 60 ft. , Passive Perception 9
Languages: understands the languages it knew in life but can’t speak
CR: 1   Ice Walker: The draugr can walk on ice without any penalties.
Ice Burst: When reduced to 0 hit points, the frostbitten draugr explodes into many shards of ice. Any creature that is caught within 10 feet of it must succeed on a DC 13 Dexterity saving throw or take (2d4) cold plus (2d4) piercing damage, it takes half as much damage on a successful save.
ACTIONS Multiattack: Frostbitten draugr makes two shortsword attacks.
Shortsword: Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: (1d6 + 2) slashing plus (1d4) cold damage.   Ice Shards (1d4 shards): Ranged Attack: +4 to hit, range 30/60 ft., multiple targets. Hit: (2d4) piercing damage plus (2d4) cold damage, and the targets’ speeds are reduced by 10 feet until the start of their next turn.
Loot:

• Shortsword 
• Hel Shoes only if in Helheim!

The frostbitten draugr are created by the draugr frostbringers. They have the essence of the Black Winter imbued within. While most of them show the essence of frost clearly by ice shards growing from their body, some of them are much more sinisterly imbued: They only have thin layers of ice on their flesh and rusty armor. When a frostbitten draugr is destroyed, it explodes and spreads the frost essence to those around it.