For now, it seems to me that the Bretonnian Grail Knights are pretty hard to corrupt and a bit of testing with events has made me aware that they can lose their grail knight trait through various methods. They seem to still age normally though, despite having the extended lifespans.
Going by the health values their max lifespans should be comparable to Numenorean kings of the Middle Earth Mod, thus around 250-300 or more.
Going by the health values their max lifespans should be comparable to Numenorean kings of the Middle Earth Mod, thus around 250-300 or more.