How to get the last Authority points?

[Darkrenown]

Vassalization in general is too powerful. The relationship should be difficult to manage, and if relations are low they should betray you and join enemies during wars sometimes etc.

Forgive me if this is already in the game, I never see it.

That can happen in HttT, although up until now it wasn't possible.

 

[Darkrenown]

What do you mean? Vassals could declare war on their overlord in IN, but only if you weren't allied. Will they do so now even when you are, or what else is the difference?

They can now break the alliance and DoW.

 

[Darkrenown]

Not in 4.1 though, AI nations won't join the HRE if a player is the Emp.