Xi Construct

The  is a Boss Monster added in the Survivors of the Void expansion, and is part of the monster family. Being a Boss, the Xi Construct may be encountered after initiating a stage's Teleporter Event. It can otherwise spawn naturally during higher difficulties.

Primary: Xi Cannon
The Xi Construct's front opens and after 1 second it fires a devastating beam at its target that deals 10 x 100% damage per second with a proc coefficient of 0.3 per tick. After 4 seconds the attack concludes by creating an explosion, which is indicated by a golden ring on the ground where the beam strikes. The blast deams 400% in a radius of 15m with linear falloff, with a proc coefficient of 0.0, a force magnitude of 6000 and a bonus force of 2000 in the y-direction. The attack has an end lag of 2 seconds.

The Xi Construct cannot change its firing angle when using this skill, but it can move back and forth horizontally to chase its target.

This skill has a cooldown of 8 seconds.

Utility: Xi Barrier
The Xi Construct creates a golden spherical shield with a radius of 15m around itself that functions similarly to, blocking projectiles (including hitscan projectiles) from the outside, but not those from the inside. The shield will stay up for 10 seconds and the Xi Construct will move but not attack for the duration; however, its will continue to attack.

This can be countered by going inside the shield and attacking the Xi Construct from inside; however, this may be difficult with less mobile Survivors.

While channeling the Xi Barrier, the Xi Construct will face downward and slowly rotate to the side, with any Alpha Constructs currently mounted on its faces rotating along with it.

The shield does not give any defensive buffs; it simply creates a spherical boundary that does not allow projectiles to cross it or any targetting attacks to acquire a target past it.

This skill has a cooldown of 15 seconds (which does not begin until the shield has disappeared).

Special: Tetra Alpha
The Xi Construct spawns with 4 allied on its corners, which support it with additional firepower. After these are destroyed, the Xi Construct periodically re-summons them.

This skill has a cooldown of 4 seconds. It can store up to 4 charges, and it can only be used if there is at least one empty spawning location.

Behaviors

 * 1) Use special: no requirements. This means upon entering combat the Construct will instantly summon 4 Alpha Constructs.
 * 2) Use utility: the Construct must have less than 50% health. This behavior cannot be used twice in a row, which is only relevant if the Construct has.
 * 3) Chase: the Construct must be more than 200m away from its target. This behavior will be active for 3 seconds upon selection.
 * 4) Use primary: the Construct must be within 150m from its target and have line of sight. This behavior cannot be used twice in a row.
 * 5) Follow: the Construct must be more than 100m away from its target. This behavior will be active for 0.5 seconds and cannot be selected twice in a row.
 * 6) Strafe: the Construct must be within 30-100m from its target. This behavior will be active for 0.5 seconds and cannot be selected twice in a row.
 * 7) Flee: the Construct must be within 30m from its target. This behavior will be active for 0.5 seconds and cannot be selected twice in a row.
 * 8) Stop: no distance requirements. This behavior will be active for 2 seconds and cannot be selected twice in a row. This means that if all skills are on cooldown (or currently in use) and the target in within 200m, the Construct will alternate between a behavior from 5-7 for 0.5 seconds and standing still for 2 seconds.

Loot
Main Article: Defense Nucleus

If the is the Teleporter Boss, there is a 15% chance for the Uncommon item (that drops as a reward for defeating the ) to be replaced by its Boss item, the.

Version History

 * Survivors of the Void
 * (Undocumented) Added New Boss: Xi Construct

Trivia

 * Until the second Survivors of the Void patch, it was possible to encounter the Xi Construct even without enabling the DLC when the was enabled.
 * May be a reference to the 6th Angel, Ramiel, from the anime Neon Genesis Evangelion.