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[ME] Gate Pass Invasions

Wait, but doom stack spawns suck!
No fear! This utilises the invasion marker system introduced with Twisted and Twilight. As such, markers will be placed warning you how long you have to intercept the mustering forces before they do spawn.

How does it work?
If you own any of the gate passes, you have a 50% chance on the start of your turn to spawn an invasion marker that will spawn an army whose aim is to attack that gate pass. There is a 10 turn cooldown after such a spawn, before you go back to the 50% chance on turn start.

Typically, an invasion marker will give you 3 turns to prepare or intercept it. Although be warned, sometimes a marker spawns with less turns. Each gate has 3 potential spawn locations, so it could change from time to time.

Who attacks?
The high Elven gates are only attacked by Norscan raiders, Vampire Coast Pirates or Dark Elf slavers. They will always approach from the outer ring of Ulthuan.

The Empire forts are attacked by Greenskins, Beastmen and Skaven, representing the types of folks who emerge from the wilderness looking for a fight. They can approach the gates from both sides, spawn locations generally picked in woodlands and near mountains to make it more believable.

The notion is that these creeps just want to get through the pass, so band up and attack the fort/gate.

Work for the AI?
Nope, the interactive marker system doesn't work for the AI. I should note that it doesn't matter what faction you are as the player, so long as you can occupy and own them.

Settings and MCT
The strength of an army is defined based on turn count and difficulty playing. The further in game you are, the harder the armies.
The other settings can be tweaked with MCT - however the defaults are:
Full invasion army size: 20
Invasion army size modifier when interrupted early: -10
Invasion army size modifier when interrupted half way through mustering: -5
Invasion army size modifier when interrupted just before finishing: -3
The % chance of spawning an invasion when off cooldown: 50%
Turn Cooldown after invasion spawn: 10 turns (this is for each gate, and is not globally shared)