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Horror Stuff
The "global horror level" is defined as follows:
Default is 1.
If AC is active, that is boosted to 10
If the cataclysm has hit, it is 20
If it is the turn before the cataclysm hit, it is 10
If it is 2 turns before the cataclysm hits AND AC is not up, it is 5
Spawning a horror:
Calculate an upgrade value.
By default this is 15
If a province is involved, set this to (DRAIN scale in the province + 3) * 5
Add the haunted unit's horror marks * 20 to this
If the upgrade value is less than 500, the upgrade value is set to 500 + floor((upgrade value -500) / 5)
- Get the global horror level. If it is 1, consider it as if it were 3. Otherwise, set upgrade value to (upgrade value + floor(horror level / 2)) * floor(horror level / 2)
If asking for a lesser horror:
Get a random number 0-999
If upgrade value ⇐ this random number, you get a lesser horror of some description, otherwise, continue as if you asked for a greater horror
If looking for a greater horror:
Greater horror upgrade value = max(global horror level, floor(upgrade level/10))
If greater horror upgrade value ⇐ random number 0-999, make a greater horror, else continue as if asking for a doom horror
If looking for a doom horror:
complicated things
Astral Corruption and Cataclysm attacks
Technically, these happen any time the global horror level (as above) is greater than 1. They do not happen on things whose path is blood magic (but items with a mixed gem/slave component will still trigger for their gem part), nor do they happen to mindless or slave vessels
Calc some number that I'm going to call the "horror score". This is (horror marks * 20 + 1) - province drain scale + (what I assume to be the number of gems you are spending)
Roll an exploding d(350/global horror level). If the horror score <= the die result, you get attacked
Roll an exploding d250. If the horror score >= the result, you get attacked by a doom horror
Otherwise, roll an exploding d100. If the horror score >= the result, you get attacked by a greater horror
Otherwise you get attacked by a lesser horror