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What if all the castles turn out to be Chaos castles? :-D
Well, that scenario seems unlikely. I'll add it to the readme so that a restart is offered in that case =D
What exactly is a "castle of your own faction" on an unknown respawn point? There are several respawn points. The player doesn't know which one they'll end up on. Their castle is located there, of course. Is that correct?
What I suggested is this: there's a castle. The player starts from it and ends up on an unknown respawn point. Is that the same? Seems like it.
If the castles are predetermined and unchanging, then the player can also anticipate where to start. That is, the basic respawn point will always be the same. If, for example, there are 2 Nature castles, then it's a 50/50 chance.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!