Blitzcrank, The Great Steam Golem

Lightning Absorption. Whenever Blitzcrank is subjected to lightning damage, he takes no damage and instead regains a number of hit points equal to the lightning damage dealt.

Immutable Form. Blitzcrank is immune to any spell or effect that would alter his form.

Magic Resistance. Blitzcrank has advantage on saving throws against spells and other magical effects.

Magic Weapons. Blitzcrank's weapon attacks are magical.

Sentry's Rest. Blitzcrank doesn't require sleep and instead enters a dormant state for 6 hours when he needs a long rest to recharge an ability. Blitzcrank is not rendered unconscious and remains aware of sounds in his surroundings but is considered blinded while resting.

Antimagic Susceptibility. Blitzcrank's abilities have a 50% chance of failing while in the area of an antimagic field. If targeted by dispel magic, Blitzcrank must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.

Multiattack. Blitzcrank uses Power Fist then makes 2 Slam attacks.

Slam. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 7) bludgeoning damage.

Rocket Grab. Ranged Weapon Attack: +12 to hit, range 30/60 ft., one target. Hit: 12 (1d10 + 7) bludgeoning damage. If the target is Large or smaller Blitzcrank pulls the target to him and grapples them. They are considered restrained while grappled in this way.

Power Fist. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 7) bludgeoning damage. Target must succeed on a DC 15 Strength saving throw or be knocked prone.

Overdrive (2/Long or Short Rest). As a bonus action, Blitzcrank shifts into Overdrive. Blitzcrank becomes hasted for 1 minute. At the end of the duration Blitzcrank's speed is reduced by 10 for 3 rounds.

Static Field (Recharge 6). Blitzcrank expunges his Static Field in a 15-foot radius. Each creature in that area must make a DC 19 Constitution saving throw, taking 40 (8d8) lightning damage and be paralyzed until the end of their next turn on a failed save, or half as much damage and are not paralyzed  on a successful one.

• While available, Static field shocks 1 random hostile creature within 10 ft. of Blitzcrank for 4 (1d8) lightning damage.

Mana Barrier. Blitzcrank can activate this barrier in response to an attack or damaging spell. Blitzcrank gains a number of d6 equal to the number of charges he has acquired worth of temporary hit points.

• This shield extends outward 10 ft. in every direction centered on Blitzcrank.
• Friendly creatures inside Mana Barrier automatically succeed saving throws from area of effect spells.
• Blitzcrank gains 1d4 charges every round.
• When targeted by a spell Blitzcrank gains 1 charge per spell slot level (i.e. 3rd level spell grants 3 charges).

Blitzcrank 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. Blitzcrank regains spent legendary actions at the start of his turn.

Crush. Blitzcrank makes one Slam attack.

Yoink!. Blitzcrank uses Rocket Grab.

Combo! (Costs 2 Actions). Blitzcrank uses Rocket Grab, if it hits he then uses Power Fist on the same target.