Mizzium Plating. Any critical hit against the zenith engineer becomes a normal hit. If it succeeds on a strength or constitution saving through and takes half damage, it instead takes no damage instead.

Tool Expert. The Zenith Engineer has expertise with any tool in their hands, able to add their proficiency bonus twice to a tool check.

Magic Item Savant. The zenith engineer can attune up to six magic items at once. It can ignore all class, race, spell, and level requirements at attuning or using a magic item.

Magical Infusions. The zenith engineer is 20th level artificer and can make 4 infusions from the Artificer Infusions table.

Spellcasting. The zenith engineer is a 20th-level spellcaster. The zenith engineer's spellcasting ability is Intelligence (spell save DC 21, +13 to hit with spell attacks). The zenith engineer has the following artificer spells prepared:
Cantrips (at will): fire bolt, mage hand, mending, prestidigitation, chill touch, [Tooltip Not Found]
1st level (4 slots): expeditious retreat, sanctuary, thunderwave, absorb elements
2nd level (3 slots): blur, <i>heat metal[/spell], scorching ray, see invisibility
3rd level (3 slots): dispel magic, fly, haste, revivify
4th level (3 slots): freedom of movement, mordenkainen's faithful hound, stoneskin
5th level (2 slots): animate objects, wall of force

Multiattack. The zenith engineer makes four attacks, or it makes two attacks and uses spellcasting.

Modified Sword. Melee Weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 20 (4d6 + 6) slashing damage plus 21 (6d6) lightning damage.

Blitzer Cannon. Ranged Weapon Attack: +11 to hit, range 80/320 ft., one target. Hit: 21 (3d10 + 5) piercing damage plus 18 (4d8) fire damage.

Flash of Genuis (7/Day). When the Zenith Engineer or another friendly creature it can see within 30 feet of it makes an ability check or a saving throw, it can use it's reaction to add their Intelligence modifier to the roll.

The executive engineer 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 bladebot regains spent legendary actions at the start of its turn.

Attack. The zenith engineer makes one weapon attack.

Cantrip. The zenith engineer casts a cantrip.

Cast a Spell (Costs 2 Actions). The zenith engineer casts a spell that takes 1 action to cast.