Werebear

5e compatible shield

Medium humanoid (human, shapechanger), neutral good

Armor Class 10 (10 in humanoid form, 11 in bear and hybrid form)
Hit Points 135 (18d8 + 54)
Speed 30 ft. (40 ft., climb 30 ft. in bear or hybrid form)

STR DEX CON INT WIS CHA
19 (+4) 10 (+0) 17 (+3) 11 (+0) 12 (+1) 12 (+1)

Saving Throws 
Skills Perception +7
Damage Resistances 
Damage Immunities bludgeoning, piercing, and slashing from nonmagical attacks not made with silvered weapons
Condition Immunities 
Senses passive Perception 17
Languages Common (can't speak in bear form)
Challenge 5 (1800 XP)

Shapechanger. The werebear can use its 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.

Keen Smell. The werebear has advantage on Wisdom (Perception) checks that rely on smell.

Actions

Multiattack. In bear form, the werebear makes two claw attacks. In humanoid form, it makes two greataxe attacks. In hybrid form, it can attack like a bear or a humanoid.

Bite (Bear or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) 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). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Greataxe (Humanoid or Hybrid Form Only). Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 10 (1d12 + 4) slashing damage.