Loggy's Dome of Corruption reverse engineering notes
This concerns itself only with the horror marking and eating part of the dome. The other stuff seems to be well known already.
This is done for each unit in in the province
There is a ((Sum of all non holy paths * 2) + 2)% chance for any unit to gain a horror mark. This does not affect mindless commanders or those that are slave vessels
If the chosen unit is a commander:
There is a (10*<number of horror marks on the commander>)% chance (with a max of 50%) for a commander to be targeted by a random lesser horror