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Nominated for deletion (reason: Individual glitches of note should be added to the relevant articles rather than a single one.)
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Some sections or situations are affected by technical errors in the Deus Ex series. While uncommon in their occurrence, they exist nonetheless and can cause issues for the player.
Deus Ex GlitchesEdit
Glitched Brooklyn Naval Shipyard Conversation
This is a glitch that occurs with the friendly soldiers outside of the Brooklyn Naval Shipyard (if the player had spoken to Vinny prior to make them friendly). It is unknown what causes this glitch, but it crashes the player's game when they speak to the soldier who acknowledges who JC is. Avoiding that particular soldier or skipping through the conversation will generally stop it from occurring.
Escaping Anna Navarre
This is an exploitable glitch that pure non-lethal players can use to complete the game with no deaths by the player's hands. It is possible to trick Anna Navarre into opening the door at the entrance to UNATCO, allowing JC to escape without the key from Alex Jacobson.
Deus Ex: Invisible War GlitchesEdit
Some Multitools will not stack with the player's collection of Multitools (as in before the 20 stack limit).
Deus Ex: Human Revolution GlitchesEdit
This is a glitch that occurs during the "conversation fight" with David Sarif after the Highland Park level. There is a chance where Sarif's facial animations do not play, causing his voice files to play but with no facial animation. It is unclear what causes this glitch, though it can be rather humorous.
Knocking Out Jaron Namir
This is a glitch that can be used to the player's advantage in the Jaron Namir boss fight. With correct timing when Namir climbs over a wall during the fight, the player can activate a non-lethal takedown, defeating Namir instantly.
This is a graphical glitch that may occur where the textures for the environment and character models (minus the head for some reason) appear to be covered in a grainy, glitched texture.
Talion A.D. Mission Bug
This is a glitch that is present in the Talion A.D. quest where the mission does not update after finding information within the butcher shop. Note that this glitch is always present and is not random.
Body Drag Death Glitch
This is a glitch that may occur if the player moves an unconscious enemy after them being in one place for a long time. If the player tries to drag them, they will be rendered dead after rag-dolling for a moment. It is unclear if this affects the Pacifist Achievement.
This glitch happens when you deactivate a fan or destroy it and you simply aren't able to go through where it was when you are supposed to.