I have an Albion achievement run going, and there is only one province blocking me from the achievement. Despite having ~80% integrated culture, having the already colonized timer wore off, and having>10 (I know new min is 8), I can't colonize it due to the province being a holy site, and you can't desecrate holy sites without owning them, thereby soft locking me out of ever being able to form Albion.
The most annoying thing is if the AI ever makes a holy site, and is then sacked and uncolonized you will never be able to form whatever country needs that territory again. Making any run pretty much just fully rng based on whether or not the AI places a holy site on a low population province and then gets sacked. Hell, this will probably prevent any formidable nation from forming, so as long as you make something a holy site then do something to lower pop enough to where the province becomes uncolonized
The most annoying thing is if the AI ever makes a holy site, and is then sacked and uncolonized you will never be able to form whatever country needs that territory again. Making any run pretty much just fully rng based on whether or not the AI places a holy site on a low population province and then gets sacked. Hell, this will probably prevent any formidable nation from forming, so as long as you make something a holy site then do something to lower pop enough to where the province becomes uncolonized
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