[@Voltus_Ventus]

What makes you say that if not for mutual benefit they'd otherwise be at one another's throats? It's really easy to become Tin's enemy if you suppress any Ajdars in your nation, mock the faith, or deny missionaries. But by the same token it's equally possible to earn Tin's almost unwavering friendship if you let Ajdar believers openly worship and don't oppose missionaries. Granted, this gives Tin some influence over you if you do it, but to be fair Ventium has a great deal of influence over Tin. It's a tradeoff worth considering.

And while Tin is happy to attempt spreading their religion peacefully, it's not as if they're so good at it that suddenly the Ajdars would become the majority in Ventium and take over. The religion has a bad reputation and so there wouldn't be any insane number of converts.