Threat Level

Threat Level or popularly known as Aggro defines how dangerous a non-player character perceives a target to be and thus the importance of attacking that target. NPCs will prioritize attacking the target with the highest threat level that is within range.

Increasing Threat Level

Abilities

The following abilities will temporarily increase threat level:

•  Khora's  Strangledome: Creates a dome that captures and ensnares enemies; captured enemies are susceptible to friendly fire, with high threat level.
•  Loki's  Decoy: Creates a decoy with high threat level.
•  Mirage's : Creates clones of Mirage with high threat levels.
•  Nekros' : Creates shadow versions of recently fallen enemies which have high threat levels.
•  Nidus's  Ravenous: Creates maggots with high threat levels.
•  Nyx's
  •  Absorb: Increases the caster's threat level.
  •  Chaos: Increases the threat level of affected enemies, thus making them attack each other as well as members of other factions.
•  Octavia's  Resonator: Creates a Resonator with high threat level.
•  Revenant's thralls created from  Enthrall.
•  Saryn's  Molt: Creates a decoy with high threat level.
•  Titania's  Razorwing: Creates Razorflies with high threat levels.
•  Wukong's  Defy: Increases the caster's threat level.
  •  Celestial Twin also gains increased threat level under Defy.

Mods

The following mods will increase threat level:

•  Guardian Derision: Increases threat level when blocking.

Actions

The following actions will increase one's threat level:

• Capturing the target in Capture missions.
• Rescue target in Sortie Rescue missions.

Items

The following item has an increased threat level:

• Deployed Pherliac Pod has an increased threat level against the Infested, including Corrupted Ancients.

Specters

• The Shield Osprey Specter has a high threat level, causing enemies to attack it more likely than players or objectives.

Other

• The Xiphos Turret has a low threat level, less likely to be fired upon if other allies are nearby.
• Djinn's Fatal Attraction increases its own threat level significantly, causing enemies to lock on (and sometimes fire on it, which is a bug) for the duration.

Trivia

• Prior to an update around Update 10.0 (2013-09-13),  Rhino's  Iron Skin increased the caster's threat level.