Shapechanger. The werebear can use its bonus action to polymorph into a Large bear-humanoid hybrid or into a Large bear, or back into its true form, which is humanoid.
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.
It can do this an amount of times equal to it's Strength modifier per day.
Bite (Bear or Hybrid Form Only). Proficient. Melee Weapon Attack: +Str to hit, reach 5 ft., one target. Hit: 15 (2d10 + Str) piercing damage. If the target is a humanoid, it must succeed on a DC 14 Constitution saving throw or be cursed with werebear lycanthropy.
Claw (Bear or Hybrid Form Only). Proficient. Melee Weapon Attack: +Str to hit, reach 5 ft., one target. Hit: 13 (2d8 +Str) slashing damage.