Arcane Hover Unit

Accelerate. For every 10ft. that the Arcane Hover Unit moves before its attack it does an additional 1d8 bludgeon.

Remote Control/Sentry/. The Arcane Hover Unit is either controlled by a sentient being with an Intelligence score of at least 10 or can be set up as a sentry.

Arcane Core. If the Arcane Hover Unit's core is removed or destroyed it goes offline until it is put back or replaced 

Spellcasting. The Arcane Hover Unit is a 2nd-level spellcaster. Its spellcasting ability is Dexterity (spell save DC 16, +6 to hit with spell attacks). The Arcane Hover Unit has following Artifacter spells prepared:
1st level (3 slots): Absorb Elements, Arcane Weapon

2nd level (1 slot): Heat Metal

Slam. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 1d10+4 force damage and 1d8 bludgeon damage. 

Pin. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 1d12 bludgeon damage. If the target is 5ft. from the wall they are considered pinned as long as the Arcane Hover Unit is within 5ft. of them and doesn't attack anyone but the creature that's pinned.

Sentinel. If a creature leaves its melee range (5ft.) it can use its reaction to to hit them. If they are successfully hit they don't move for the rest of their turn.

Uncanny Dodge. When the Arcane Hover Unit's core is removed or destroyed it goes offline until it is replaced or put back.