AX3-100

Robotic Fortitude. As a robot, you don't need to sleep, drink, or eat.

Legendary Resistance (3/Day). If AX3-100 fails a saving throw, it can choose to succeed instead. 

Extra Action. You have 3 actions.

Lucky rolls. AX3-100 rolls advantage on everything.

Magical Attacks. Your attacks are magical.

Protection from spells. When AX3-100 has to make a DC save against a spell and successfully saves and the spell is a damaging spell it can decide to take no damage.   

Wings. As a bonus action, AX3-100 can extend, or retract, its metal wings from its body giving it a 40ft fly speed.  

Target in my sights.  When initiative starts AX3-100 picks a target, when AX3-100 attacks the target AX3-100 deals an extra 3d10 necrotic damage. When the target dies or falls unconscious AX3-100 can pick a new target as a reaction. 

Spell slot recovery. Whenever AX3-100 takes 60 lightning damage on a turn it can choose one of the following to recover 1 5th level spell slot, 2 4th level spell slots, 2 3rd level spell slots, 2 2nd level spell slots, 3 1st level spell slots.

Immutable Form. Any effect that would change AX3-100's form is canceled.   

Spellcasting. The AX3-100 is a 20th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 24, +16 to hit with spell attacks). The AX3-100 has the following Artificer spells prepared:
Cantrips (at will): Fire bolt (see "Actions" below), shocking grasp, mage hand, prestidigitation
1st level (4 slots): detect magic, absorb elements*, grease                                                          2nd level (3 slots): enlarge/reduce, heat metal, catapult                                                              3rd level (3 slots): blink, dispel magic, haste                                                                                     4th level (3 slots): elemental bane*, Mordenkainen's faithful hound, Otiluke's resilient sphere                                                                                                                                                      5th level (2 slots): wall of stone, Bigby's hand, transmute rock*                                                   Xanathar's Guide to Everything*                                                                                                        AX3-100 does not need material components to cast spells.  

Multiattack. AX3-100 makes 4 attacks: 2 with its Armblades and 2 with its Turrets

Armblade. Melee Weapon Attack: +18 to hit, reach 5ft., one target. Hit:  26 (5d8 + 10)  slashing damage plus 10 (2d8) force damage.

Turret. RangedWeapon Attack: +14 to hit, range 150/600 ft., one target. Hit: 23 (4d10 + 2) piercing damage.

Fire Bolt (cantrip). Ranged spell attack: +14 to hit, range 120ft., one target. Hit: 22 (5d10) fire damage.

Laserbeam (Recharge 5-6). AX3-100 shoots a deadly beam from its eyes, a 10ft wide 60ft long line of radiance. Anyone caught in this line must make a DC 24 Dexterity saving throw. On a failed save, a creature takes 105 (20d10) radiant damage and suffers one level of exhaustion. On a successful save they take half damage and don't suffer a level of exhaustion.        

Fight back. Whenever a creature attacks you and is 5ft away from you, you can use one Armblade attack against that creature.   

AX3-100 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 AX3-100 regains spent legendary actions at the start of its turn.   

Cast spell. The AX3-100 cast's a spell.                                                                                             Better caster (costs 2 actions). AX3-100 casts a 5th level spell without using a spell slot.  Enhanced laserbeam (costs 6 actions). AX3-100 uses the Laserbeam action but instead, the damage is 155 (30d10) radiant damage and 2 levels of exhaustion.