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.

Destroy or successfully assault a Scout, Fighter, Raider, Destroyer, or Abductor: +10%
Destroy 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, aggression is reset to 5% * months passed. However, if an Alien Base was raided in the last month, the Aggression is set to 100% instead.

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

In general, High Aggression leads 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

Alien Leaders

0-59% Aggression: Normal levels on alien leaders
60-89% Aggression: +1 Level to all alien leaders
90-100% Aggression: +2 Levels to all alien leaders

Protecting Harvesters

If the aliens are being very aggressive, they will try to move their Harvest Missions that reside in XCOM territory. This will cost them 2% resource each time they do, and they may have to do this multiple times.

Relocate chance: Aggression / 2