Codex (XCOM 2)

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Reason: stats, duration, cooldowns, Range.

Codex
Statistics per difficultyRookie | Veteran | Commander | Legend
Aim	75 | 80 | 80 | 80
Crit-Chance	- | 10 | 10 | 10
Health	8 | 12 | 12 | 13
Dodge	20 | 25 | 25 | 25
Mobility	12 | 12 | 14 | 14
Will	100 | 100 | 100 | 100
Immunities	Burning, Poisoned, Acid Burn
Weapons /Attacks	Beam Rifle: 4-5 damage (+2 critical damage)
Abilities	Teleport, Clone, Psionic Rift

1/2

The Codex (pl. Codices) is an alien encountered in XCOM 2. It acts as a highly mobile unit, primarily living within the aliens' and ADVENT's computer systems.

“	Commander, that appears to be the Codex responsible for safeguarding the alien data stores. We'll have to neutralize it if we intend to recover the data.	”
–Richard Tygan

Description

The Codex is a mysterious mechanical alien taking on the appearance of a human female with completely golden skin, with a featureless face save for a pair of glowing, white eyes, and a black, smoke-like substance flowing out of its head resembling hair. Its body is in a state of continuous flux, constantly appearing and disappearing on the spot, and sometimes creating short-lived, translucent after-images of itself beside it. The Codex is also seen carrying a standard issue Beam Rifle as its primary weapon.

Deployment

The Codex first appears as an enemy unit when XCOM deploys the Skulljack against an ADVENT Officer, following which it will spawn as a hostile unit. On subsequent missions it is usually in groups of two.

Abilities

• Teleport: A Codex is capable of teleportation, instantly moving around the battlefield from one point to another. This ability allows a Codex to completely ignore Overwatch shots, and position itself in ideal firing spots. Teleportation range: 24 tiles.

• Clone: If a Codex takes a non-fatal hit, it will leave behind a clone of itself in place as it teleports to a new location. Any remaining hit points that the Codex has after being hit will be split between the clone and the original. There is no hard limit to the number of clones the Codex and its clones can create. The Codex is unable to clone itself if it has only 1 hit point left after taking damage, and will simply teleport to a new location instead.
  • When hit by an Overwatch shot, the Clone ability is triggered only when the Codex finishes its move. This means you can kill a Codex with multiple Overwatch shots before it has the opportunity to use Clone.
  • Codices produced from the Clone ability are exact replicas of the original Codex; they are also able to use Clone and Teleport.

• Psionic Rift: The Codex has an ability to cast a psionic rift that covers a large area of effect, which will disable the use of normal primary weapons inside it, resulting in the weapons being emptied of ammunition and thus forcing players to reload to use them again. Secondary weapons like swords and pistols are unaffected. This rift will detonate after a turn, dealing damage to any units caught inside its radius. Any active clones will also have the ability to cast this skill independently of the original.

Behavior

• A Codex will very rarely move on its own, instead using Teleport, which has no cooldown, to traverse the map. The Codex cannot teleport when using its retaliation move when spotted.

Notes

• The Codex is susceptible to Bluescreen Rounds and EMP Grenades.
• The Codex is affected by mental effects such as Psi Operative's Domination, Insanity, and can be mind-controlled.
  • A mind controlled Codex does not use Clone when hit.
• Templars' Resistance Order Feedback effect is activated when the Psionic Rift is used by a Codex, and the damage applied to a Codex forces it to automatically use the Clone ability.

Tips

• Because of the Clone ability, it is usually preferable to try and destroy the Codex with a single hit. A Ranger or a Sharpshooter equipped with Bluescreen Rounds are particularly well suited for this task due to their weapons' high damage potential. A Ranger with a high critical hit chance, or one with the Conceal and Shadowstrike skills, is also ideal for attempting this.
• You can prevent Cloning by disorienting the Codex before attacking, Usually done via flashbang. Burning/incendiary grenades do not work because it is immune to burning, however, being a mechanical enemy it can be stunned with an EMP grenade for a short period of time, in addition to the damage the grenade causes.
• A Ranger with an Arc Blade can potentially stun a Codex, removing its ability to teleport or clone itself upon taking damage.
• Another ideal tactic is to first destroy the Codex's cover without damaging it by using a well-placed grenade or Demolition, and then hitting it with a single powerful shot, like the Sharpshooter's Deadeye. If the Codex survives, both it and its clone will be left with minimal health and the original will be exposed.
• If the Codex does manage to create a clone, a class that can deal damage multiple times a turn is useful for eliminating both units. A Sharpshooter specialized in the Gunslinger tree is optimal, as the clones have very little health and can often be killed with a single pistol shot.
  • If the clones have teleported far away, the Sharpshooter's Serial ability can also be used for taking down every clone.
  • The Ranger also has the capability to take down multiple clones in a single turn with the Reaper ability.

Trivia

• The Codex has a similar role and description as the Outsider from Enemy Unknown, both being pieces of the alien data network aka “keys” and both being described as almost entirely made of pure energy. It’s possible the Codex is an upgraded successor to the Outsider and has replaced them, being able to not only use plasma weaponry but Psionic powers, whilst discarding the heavy armor. And both have a very similar yellow-orange spark hue.

Technical notes

• File XCOM 2/share/data/xcomgame/config/defaultai.ini has line #2507:

  ; -------------------- Codex (Formerly 'Cyberus') -----------------------------

  • The files of the Codex are named like cyberus, perhaps indicating that the name was changed at some point during the development process.

Verification

• Codex ability Psionic Rift removes concealment (including Reapers' Shadow concealment): test and verify.
• Codex ability Clone: test and verify what are the chances, circumstances (e.g. overwatch shots on enemy unit reveal), and/or HP threshold for a Codex to not clone itself.