Arcane Clockwork Guardian

Arcane Connection. The Arcane Clockwork Guardian is mystically bound to each Clockwork Engine Core. If a core is destroyed the guardian takes 35 damage and loses the ability connected to that core.

Core Swap. The Arcane Clockwork Guardian use a bonus action to switch it's core to Flame, Silver, or Mending.

Regeneration. The Arcane Clockwork Guardian regains 12 hit points at the start of its turn if it has at least 1 hit point. (Mending Core Only)

Multiattack. The guardian makes two fist attacks.

Fist. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage.

Radiant Blast. Ranged Weapon Attack: +5 to hit, reach 10/60 ft., one target. Hit: 12 (4d4 + 2) radiant damage. (Mending Core Only)

Fire Breath. The Arcane Clockwork Guardian exhales fire in a 20-foot cone. Each creature in that line must make a DC 15 Dexterity saving throw, taking 21 (6d6) fire damage on a failed save, or half as much damage on a successful one. (Flame Core Only)

Blade Burst. Each creature within 5 ft. of the Arcane Clockwork Guardian must make DC 15 Dexterity saving throw saving throw. On a failed save, a creature takes 20 (3d12) slashing damage and is knocked prone. On a successful save, the creature takes half as much damage and isn't knocked prone. (Silver Core Only)

Shield. When a creature makes an attack against the core, the guardian grants a +3 bonus to the core's AC if the guardian is within 5 feet of the core.