Death Mark

Death Marks are a system used to denote that the player has been targeted for assassination by one of the game's three Assassins - Stalker, Zanuka Hunter, and The Grustrag Three - or one of the 6 Syndicate's Death Squad which gives them a chance to appear in missions that the player participates in. Death Marks are attained by successfully completing certain mission types or certain goal. A player can have multiple death marks from a single assassin and death marks from every assassin active at once. Death Marks of the same type from multiple players can stack, increasing the chances of that particular assassin appearing in a mission.

Since Update 15 players can see their active Death Marks in their profile.

Stalker
To gain a Death Mark from the Stalker, players have to kill a boss in the solar system (except Captain Vor on Mercury). Multiple Stalker Death Marks can be earned by killing the same boss multiple times, killing all the bosses once, or a combination of both. Note that you will not always receive a death mark from killing a boss.

Once marked, players will receive an email from the Stalker himself. The subject will be the name of the last boss to be killed and the body will be "Your actions have consequences".

Zanuka Hunter
To gain a Death Mark from the Zanuka Hunter players have to complete at least 5 Invasion missions in the Grineer's favor, sometimes more. Once marked, players will receive an email from Alad V with the subject "Another Volunteer" and body "Thank you for your continued interest in the Zanuka Project. A member of our staff will assist you shortly."

The Grustrag Three
As opposed to the Zanuka Hunter, to gain a Death Mark from The Grustrag Three, players have to complete at least 5 Invasion missions in favor of the Corpus, sometimes more. Once marked, players will receive an email from Vay Hek with the subject "A Lesson" and body ''"Interfering with our operations is unacceptable. Your will be shown your place. Your punishment has been ordered." or "You continue to assist our enemies. Your meddling will NOT be tolerated."''

Syndicate Death Squads
Syndicate Death Squads are enemy task forces composed of Eximus units from a particular Syndicate. While they do not have Death Marks per se, they operate in a similar fashion to the above assassins. A Syndicate will start to send Death Squads once a player has earned the first negative rank for that particular group.

Tips

 * An efficient way to farm for Stalker's Deathmark is to continuously run Phobos' assassination mission as players can attain two separate death marks from Captain Vor and Lieutenant Lech Kril.