Incursion Strength (LWR)

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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.

Number of Aliens = Base Number * Incursion Strength/100
Percent Chance for an additional alien pod = 2 * (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
XCOM fails a mission	10% chance for -1 for each turn mission lasted
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 to 100 at the end of each day

x = ABSOLUTE(Incursion Strength - 100) * (6 - Difficulty) / 3    [Where difficulty is 0 to 4 for Easy to 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
Aliens	Alien Life Forms • Alien Missions • UFOs • Alien Artifacts • Alien Level • Alien Resources • Alien Aggression