I think it would be cool to have the option of leaving behind your lands to your non-heir sons after winning a varangian adventure. It makes sense realistically, and in game terms would also help bump up renown as well as make your next sucession a little more manageble in the new lands. I'm not sure if this would be over powered, but varangian adventure are already more for flavor than anything for the player. This would at least provide some benefits to help round it out.
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