Xel'naga construct

Xel'naga constructs are NPC units in StarCraft II: Legacy of the Void.

Overview
Several xel'naga constructs were left at Ulnar to guard the temple leading to the xel'naga themselves. The intent was that only when two races possessing purify of essence and purity of form worked together, could the constructs be defeated. Defeating the constructs rewarded keys to open the doors of the temple.

Game Unit
The xel'naga constructs are powerful enemies with a lot of HP and strong normal attacks. They have two abilities: in one, they target an area and then unleash an energy blast at that location, dealing damage, and release a shockwave around themselves, knocking enemies back and dealing damage. Both abilities spawn xel'naga charged crystals to aid the construct in battle.