Shapechanger. The werecobra can use its action to polymorph into a cobra-humanoid hybrid or into a giant poisonous snake, or back into its true form, which is humanoid. Its statistics 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 Only). The werecobra makes one bite and one constrict attack, or it makes one bite attack and one dagger attack, or it makes three dagger attacks.

Bite (Snake or Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (3d4 + 3) piercing damage, and the target must make a DC 14 Constitution saving throw, taking 27 (6d8) poison damage on a failed save, or half as much damage on a successful one. If the target is a humanoid, it must also succeed on a DC 12 Constitution saving throw or be cursed with werecobra lycanthropy.

Constrict (Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 10 (2d8 + 1) bludgeoning damage, and the target is grappled (escape DC 14). Until this grapple ends, the creature is restrained, and the werecobra can't constrict another target.

Dagger (Humanoid or Hybrid Form Only). Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 5 (1d4 + 3) piercing damage, and the target must make a DC 14 Constitution saving throw, taking 13 (3d8) poison damage on a failed save, or half as much damage on a successful one.