Aether Conductor

Power Absorption. Whenever the conductor is subjected to any damage after Aether Discharge, for 1 round, it regains a number of Hit Points equal to the damage dealt instead.

Immutable Form. The golem can’t shape-shift.

Magic Resistance. The conductor has Advantage on saving throws against spells and other magical effects.

Zone Anchor. While the Aether Conductor is active, the area within 30 ft. is an Artificial Overlap Zone. Spellcasting and advanced tech both function, but each use builds instability.

Stability Threshold. The conductor begins with 0 Instability. Each spell of 1st level or higher, or tech item with a power source, used within the zone adds 1 Instability. At 5 Instability, a surge occurs (see Aether Discharge), and Instability resets to 0.

Grounded Design. Excess energy is automatically vented into the ground. 

Arc Lash. Melee Weapon Attack: +4, reach 10 ft., one target. Hit: 8 (1d8+4) lightning damage.

Grinding Resonance. Each creature within 5 feet of the conductor takes 3 (1d6) thunder damage.

Aether Pulse (Recharge 5–6). The conductor releases a stabilizing wave. Each creature within 20 feet must make a DC 14 Constitution saving throw. On a failure, the creature takes 10 (3d6) force damage and has disadvantage on the next attack roll or spell attack it makes before the end of its next turn. On a success, the creature takes half as much damage and suffers no disadvantage.

Aether Discharge (Triggered). When Instability reaches 5, arcs of energy discharge into the ground. Each creature within 10 feet must make a DC 14 Dexterity saving throw. On a failure, the creature takes 14 (4d6) lightning damage. On a success, the creature takes half as much damage.