Colossal Undead

Magic Resistance. The colossal undead has advantage on saving throws against spells and other magical effects.

Charge. If the colossal undead moves at least 15 ft straight towards a target and then hits with a claw attack on the same turn, the target takes an additional 22 (4d10) piercing damage.

Electric Current. At the start of each of the colossal undead's turns, each creature within 5 ft of it takes 10 (3d6) lightning damage, and flammable objects in that area that aren't being worn or carried ignite. A creature that touches the undead colossal or hits it with a melee attack while within 5 ft of it takes 10 (3d6) lightning damage.

Emissary of the Undead. All undead within 60 ft of the colossal undead gain a +2 bonus to all damage and saving throws, and have advantage against any effect that would turn them.

Multiattack. The colossal undead makes two attacks, one with its claw and one slam attack.

Claws. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 14 (2d8 + 5) slashing damage. 

Slam. Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) bludgeoning damage. 

Lighting Bolt (Recharge 5-6). Ranged Arcane Weapon Attack: Due to the lighting infused elements coursing through its constructed body, the colossal undead can use its action to focus its hand on one area and cast lightning bolt at its base 3rd level.

• A stroke of lightning forming a line 100 feet long and 5 feet wide blasts out from you in a direction you choose. Each creature in the line must make a Dexterity saving throw. A creature takes 8d6 lightning damage on a failed save, or half as much damage on a successful one. The lightning ignites flammable objects in the area that aren’t being worn or carried.

Non-Reactive. The colossal undead cannot use its reaction to make attacks of opportunity.