Recruitable Clans - RealmofThrones/Wiki GitHub Wiki
With 1.2 Taleworlds added their kingdom destruction mechanic to the game. Normally clans would disappear if their kingdom was destroyed and they don't join another kingdom in 4 weeks.
Realm of Thrones' custom code prevents the clans from disappearing but rather leaves them at war with the kingdom that destroyed their own.
If the player has their kingdom he can recruit those clans at 50K per Clan level. If they have a relation that is below 50 the clans will not join the player. If they have above 50 it'S 50K per level. If they have a relation above 90 the clans will join for free!