Athasian Werejaguar

Croc Killer. The werejaguar suffers no ill effects from fighting in liquid.

Stalk and Ambush. The werejaguar has advantage against creatures who haven't gone yet, pouncing on an ambushed target causes the target to roll saving throws at disadvantage.

Shapechanger. The werejaguar can use its action to polymorph into a jaguar-humanoid hybrid or into a jaguar, or back into its true form, which is humanoid. Its statistics, other than its size, 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.

Multiattack. (Humanoid or Hybrid Form): In humanoid form, the werejaguar can make two weapon or unarmed attacks. In hybrid form, it can make two weapon or claw attacks.

Bite. (Jaguar or Hybrid Form): Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d10+3) piercing damage. If the target is a humanoid, it must succeed on a DC 13 Constitution saving throw or be cursed with Werejaguar lycanthropy

Claw. (Jaguar or Hybrid Form): Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8+3) slashing damage.