Multiattack

The fulminar makes three attacks: one with its bite and two with its claws.

Bite

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 14 (2d8 + 5) piercing damage and 7 (2d6) lightning damage and the target can't take reactions until the end of the fulminar's next turn.

Claw

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage and 7 (2d6) lightning damage.

Lightning Shackles (Recharge 5-6)

The fulminar magically creates three sets of shackles of lightning, each of which can strike a creature the fulminar can see within 60 feet of it. A target must make a DC 16 Dexterity saving throw. On a failure, the target takes 18 (4d8) lightning damage and is restrained for 1 minute. On a success, the target takes half the damage but isn't restrained. A restrained creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.