Evvv said:
The wiki doesn't corroborate that claim, actually, no.
Well we aren't reading the same thing then.
"It only spawns once and, once taken, will never be there again."
"If you have defeated all enemies and pressed Tab to leave without first looting the chest, you will have lost the opportunity. The contents of the chest do not appear in the hideout loot screen after pressing Tab.
The chest is lootable without defeating all enemies, so it is recommended that you clear a path to the cave and loot the chest as soon as possible. If you get defeated after looting the chest, you still keep the contents. "
-"It only spawn once" implies that there is only once chance to get it.
-Even when you defeat all enemies, if don't grab it you lost your chance.
-You can grab it before defeating all enemies, die, and you will keep it.
So it is a natural conclusion that if you are defeated without grabbing it, you lost your chance at having the gem.
Savigo said:
Is there a tweak that makes lords change culture when they abandon their native faction (not only when they are being recruited by player)? I couldn't find that on wikia.
Maybe it's not as easy as changing few numbers in the files, but it doesn't hurt to ask.
In previous version you could ask one of your lord to switch his culture to yours. I'm guessing this is still available.
You'll take a relationship hit though, IIRC.