The accord was for Zaros to acknowledgment Saradomin's babe to him (who Zaros thinks is currently captivated earnest by Nex), but when Seren's absolutely restored, she is pre-empted this and gets her elves return her from Nex rather than
So Zaros can disengage Seren's alterations to the Runescape gold alliance he desires, but it doesn't alter the truth that Seren's faction's now the person who gets Saradomin's daughter, so she is the left handed one who can acknowledgment him and fulfil the pact. So Seren wins that you either way.
And Zamorak has a altered accord entirely. Together with Armadyl and Saradomin's pacts, neither bisected was accomplished yet. Giving Zaros that the Bedrock comes aboriginal for each of them, and afresh Zaros plays his activity -- something that Seren can footfall in and over.
However, with Zamorak, it's the extra way round. Zaros was the one who performed his activity first, in daring the last ritual in Children of Mah. And so the pact's already bisected finish by the time of Endgame.
There's annihilation for Seren to Buy Osrs gold return over from Zaros, because he's already done his bit. She doesn't even try, otherwise or adequate. All that is larboard is for Zamorak to play with his allotment -- and about-face over the Stone.