Alien Aggression (LWR)

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In General

The more XCOM performs activities to bother the alien, the higher the alien's Aggression will become. Aggression determines which kinds of missions the aliens will run each month.

Increasing and Decreasing Aggression

Aggression is a value between 0 and 100%.

Increasing Aggression

A running tally of aggression is incremented over the course of the month as XCOM successfully launches operations against alien UFOs.

• Shoot down or successfully assault a Scout, Fighter, Raider, Destroyer, or Abductor: +10%
• Shoot down or successfully assault a Harvester, Terror Ship, Transport, Battleship, Assault Carrier, or Overseer: +20%
• Perform a Combat Patrol: +30%

Decreasing Aggression

At the beginning of each month, 50% aggression is removed from the current aggression down to a minimum of 0%. However, if an Alien Base was raided in the last month, the Aggression is automatically set to 100%.

Effect of Aggression

Aggression is intended to reflect the alien's become more aware of XCOM and XCOM becoming more threatening to them.

Alien Missions

Aggression Level is used to determine the types of missions the aliens will field.

In general, High Aggression levels lead to:

Triggering an XCOM Base Defense Mission

More Hunt Missions
More Research Missions
More Bombing Missions
More Terror Missions

Less Infiltrations
Less Abductions
Less Harvest Missions

Relocation of Harvest Missions

Also, the chance that the aliens will reroll the location of a Harvest mission if it resides in XCOM territory is proportional to the current aggression.

Reroll chance = Aggression Level / 2