Hel Beast

Any size fiend, neutral evil
AC: +2 (Natural Armor) HP: 50 Speed: 50 ft.
STR 17(+3) DEX 12(+1) CON 14(+2) INT 6(-2) WIS 13(+1) CHA 6(-2)
Saving Throws: CHA +0
Skills: Intimidate
Damage Resistances: Cold, Necrotic
Condition Immunities: Frightened
Senses: Blindsight 60 ft.

Languages: understands Hel, but cannot speak
CR: 4
Swallow the Soul: If the Hel beast slays a creature, the creature must succeed on a DC 10 Charisma saving throw, or its soul is consumed by the beast. Any creature that has its soul consumed cannot be resurrected by any means, other than Divine Intervention feature or Wish spell, unless the Hel beast is killed. When the beast is slain, the souls that it consumed are released and there is a 10% chance that a Ghost is summoned as a result. The Ghost may choose to fight Hel's springs (1-24%), fade away (25-75%), or try to posses a creature (76-100%).
Paralyzing Gaze: During its first turn, the Hel beast throws a Paralyzing Gaze to a creature within 30 feet of it, as a Bonus Action.
Keen Hearing and Smell: The hound has advantage on Wisdom (Perception) checks that rely on hearing or smell.
Pack Tactics: The hound has advantage on an attack roll against a creature if at least one of the hound's allies is within 5 ft. of the creature and the ally isn't incapacitated.
REACTIONS
Paralyzing Gaze (Recharge 6): The Hel beast looks at a creature within 30 feet of it, right in its eyes. The creature must succeed on a DC 10 Wisdom saving throw, or its paralyzed for 1 minute. A creature that succeeds its saving throw is immune to this effect for 24 hours.
Actions
Bite: Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d8 + 3) piercing damage plus (2d6) cold damage.
Frost Breath (Recharge 5-6): The hound exhales Frost in a 15-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking (6d6) cold damage on a failed save, or half as much damage on a successful one.

These creatures are beasts that are perverted by Helheim's essence. They look like the beast they were before they became a Hel beast, and have the same properties. Yet, they possess otherworldly traits. They are much stronger than their natural kin. While a wolf is a tough hunt for a Vik, a Hel beast can slaughter a whole hamlet before coming down. These beasts tend to stick together. A Hel beast and a pack of Hel wolves can be seen hunting together. The essence of Hel bends the very instincts of nature to herwill of death and terror. Hel uses these beasts to kidnap souls of those who fall under these creatures' claws. Hel beasts can swallow the souls of those they kil, just like eating their flesh. These souls are stored within them for a while until Hel's spring come and convey them to Helheim. Additionally, these creatures' eyes also reflect the terror of Helheim. A weak-willed victim who looks into their eyes suffer from this dread. It paralyzes them, preventing them from doing anything but stare at those unnatural eyes. Hel beast uses this gift to render their prey immobile before they get them. Hel beasts are utmost enemies of beasts of Vanir. It is believed that although unwanted in these conquered lands of Odin , Vanir beasts protect the land from the infestation of Hel beasts.