Cable Snake

Shocker. Any creature in contact with the cable snake at the start of their turn takes 18 (4d8) lightning damage.

Legendary Resistance (1/Day). If the cable snake fails a saving throw, it can choose to succeed instead.

Multiattack. The cable snake makes one Lightning Bite, one Horn Ram, and one Tail Strike attack. The cable snake can use its Swallow instead of its Lightning Bite.

Lightning Bite. Melee Weapon Attack: +11 to hit, reach 5 ft., 1 target. Hit: 16 (2d10 + 5) piercing damage and 9 (2d8) lightning damage. If the target is a creature, it is grappled (escape DC 19). Until this grapple ends, the target is restrained, and the cable snake can’t bite another target.

Horn Ram. Melee Weapon Attack: +11 to hit, reach 10 ft., 1 target. Hit: 27 (4d10 + 5) piercing damage.

Tail Strike. Melee Weapon Attack: +11 to hit, reach 10 ft., 1 target. Hit: 24 (3d12 + 5) piercing damage.

Swallow. The cable snake makes one Lightning Bite attack against a Medium or smaller creature it is grappling. If the attack hits, the target takes all of the bite’s damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the cable snake, and it takes 44 (8d10) acid damage at the start of each of the cable snake’s turns.

If the cable snake takes 40 damage or more on a single turn from a creature inside it, the cable snake must succeed on a DC 20 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the cable snake. If the cable snake dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 30 feet of movement, exiting prone.

Thunderous Slam (Recharge 5-6). The cable snake thuds its tail on the ground and a bright flash and boom emanate out to 300 feet. Any creature in a 60-foot radius must make a DC 18 Constitution saving throw or take 39 (6d12) thunder damage and be blinded, deafened, and stunned. If the creature succeeds they take half damage and only suffer the deafened condition. An affected creature can repeat the saving throw at the end of each of its turns.

Static Charge. If a creature misses the cable snake with a melee weapon made primarily of a conductive material (metal, adamantine) the cable snake can use its reaction to cause lightning to jump from its body, to the weapon, and onto the creature. The creature takes 14 (4d6) lightning damage.

The cable snake can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The cable snake regains spent legendary actions at the start of its turn.

Attack. The cable snake makes one Horn Ram or Tail Strike attack.

Move. The cable snake moves up to its speed without provoking opportunity attacks.

Pulse (Costs 2 Actions). The cable snake deals 14 (4d6) lightning damage to all creatures within 20 feet of it.