Clockwork Sniper

Immutable Form. The Clockwork Sniper is immune to any spell or effect that would alter its form.
Magic Resistance. The Clockwork Sniper has advantage on saving throws against spells and other magical effects.
Magic Weapons. The Clockwork Sniper's weapon attacks are magical.
Death Burst. When the Clockwork Sniper dies, it explodes. Each creature within 5 feet of it must make a DC 13 Dexterity saving throw, taking 4 (1d6) fire damage on a failed save, or half as much damage on a successful one.

Solitary Attacker. When the Clockwork Sniper has no creatures within 10 ft of it, it deals an extra 7 (2d6) force damage.

Perceptive technology. The Clockwork Sniper has advantage on perception checks that rely on sight.

Integrated Weaponry. The Clockwork Sniper cannot be disarmed, and it ignores the loading property with its integrated weapon.

Multiattack. The Clockwork Sniper makes two integrated crossbow attacks.

Integrated Crossbow. Ranged Weapon Attack: +5 to hit, (Range 80/320), one target. Hit: 7 (1d8+3) piercing damage.

Antimagic Bolt (1/day). The Clockwork soldier makes a ranged attack against a creature it can see within range. If that creature is a spellcaster, it must make a DC 12 CON saving throw. On a failed save, the creature can no longer cast spells while the bolt is lodged within its body. On each of the creatures turns, it can use an action to attempt to remove the antimagic bolt with a DC 14 STR check, taking 1d4 piercing damage and ending the effect on a success.