Incursion Strength (LWR)
In General
Incursion Strength (IS) is a measure of the number of aliens that will be sent to each mission. Higher incursion strengths means more aliens on missions.
Incursion Strength increases as XCOM performs well and decreases if they perform poorly.
Effect of Incursion Strength
The effect of Incursion Strength is directly increasing/decreasing the number of aliens on all non-scripted missions (which as a result increases the chances for an additional alien pod).
Number of Aliens = Base Number * Incursion Strength/100
Increasing and Decreasing Incursion Strength
Incursion Strength starts at 100 and can be modified as follows:
| Event | Incursion Strength modification |
|---|---|
| XCOM successfully completes a mission | +2 |
| A mission expires or is failed | -2 |
| A UFO is destroyed in the air | +1 |
| A soldier dies with a rank greater than the number of months passed | -4 |
| A soldier dies with a rank greater than SGT (does not stack with previous) | -2 |
| An XCOM unit dies (does not stack with previous two) | -1 |
| An aircraft is lost | -2 |
| A country is lost to the aliens | -5 |
Every day Incursion Strength moves towards 100: There is an x% chance to move 1 closer towards 100 at the end of each day
x = ABSOLUTE(Incursion Strength - 100) * Difficulty modifier [Where Difficulty modifier is 2.00/1.83/1.67/1.50/1.33 for Easy/.../Pain]
All changes in incursion strength are modified by campaign length (except for lost country). High levels of Incursion Strength will be denoted with an additional + sign on landed UFO, terror, and abduction missions.
See also
Long War Rebalance:  Aliens
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