Agmundr Aleifr

Shapechanger. Agmundr can use its action to polymorph into a Large bear-humanoid hybrid or into a Large polar bear, or back into its humanoid form. Its statistics, other than its size and AC, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Keen Hearing and Sight. Agmundr has advantage on Wisdom (Perception) checks that rely on hearing or sight.

Powerful Build (Humanoid Form Only). Agmundr counts as one size larger when determining its carrying capacity and the weight it can push, drag, or lift.

Sure-Footed. Agmundr has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.

Aggressive. As a bonus action, Agmundr can move up to its speed towards a hostile creature it can see.

Multiattack. Agmundr makes two melee attacks.

Bite (Bear or Hybrid Form Only). Melee Weapon Attack: +8 to hit, reach 5 ft., one creature. Hit: 16 (2d10 + 5) piercing damage. If the target is a humanoid, it must succeed on a DC 15 Constitution saving throw or be cursed with werebear lycanthropy, as described in the Monster Manual.

Claw (Bear or Hybrid Form Only). Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) slashing damage.

Greataxe (Humanoid or Hybrid Form Only). Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (1d12 + 5) slashing damage.