People are getting confused. The treaty Eston signed with Coria was basically a peace treaty with the added clauses that
NO realm would pass through Eston to attack Coria and that Coria would allow no realm to attack Eston.
In the Corian-Eston treaty, the North had no access to the CE other than Talerium. There was no mention of the other Northern realms whatsoever in our original peace treaty. It was only later, when Eston's allies began to complain that we verbally confirmed that they could use specific regions which were highlighted, made crystal clear, and confirmed. These as Merlin states were pretty much Belegmon and the adjoining regions to the CE. As a clause and because Saeculo hates Hammarsett, they had no permission to enter any Corian region whatsoever.
So the unofficial agreement which was made benefited the Northern realms HUGELY. Before that agreement was made, you had an extremely limited access.
Then because we were being reasonable, it was suggested that because of the new peace signed between Eston and Coria, that the other Northern realms should follow suit. The only demands from BoM and Darka was Military access to the CE which we granted and so made them happy enough to sign peace, however because Hammarsett wanted land and I was being accused of stalling because I wouldn't grant them this, the North suggested that they would become neutral as long as they had an unofficial treaty and the situation with Hammarsett would be worked out later.
OK, I'm almost 100% positive that these terms your talking about are in the version of the agreement that pretty much every northern realm refused to sign, except perhaps for Eston. I can guarantee that Darka, for one refused to sign the agreement that had those terms in it
Again, you're getting things mixed up. There was no official agreement even discussed as Hammarsett had derailed it and the North was eager to crack on against the CE. I was not happy and pointed out what many others have here that it was less than optimal not to have something in writing or at least peace signed rather than just neutrality between our realms. It was because of this that KK himself stated "whoever broke the peace between Hammarsett and Coria would have the entirety of the northern alliance turned against them in retribution for breaking such peace".
I don't know how you want me to prove it as it was said in letters. But I'm not exactly going to lie about it am I? I'm pretty sure Perth can confirm this as can KK or Sordnaz if they use the forums. I was definitely guaranteed that the North would punish either Coria or Hammarsett should one of them sidetrack the main fight which was supposed to be the CE if either realm broke the agreement, which Hammarsett did on multiple occasions without any consequence.