I think i haven't seen no one think about this one
>Most secret bosses have granted the player an item (Shadow Mantle, Devilsknife, ThornRing)
>Next few chapters will deal with Asgore one way or another
>Asgore has kept a "i'm actually nice guy" facade so far
Since Toriel and Asgore got divorced, we can assume that both of them had a fault in the marriage (and so far only Toriel has been in the spotlight, which has given Asgore the benefit of the doubt so far)
>ThornRing allows the player to "kill" through Noelle
>Noelle has been wearing a white dress in the dark worlds
>During ch. 4 snowgrave she leaned in for a kiss, only to get the ring "equipped" instead
My theory is that the next item will be a skull mask/helmet granted to the player during Asgore's chapter weird route's secret boss, and it all will tie into a wedding theme between Chris and Noelle
All items will eventually assemble as an entity
That's why i'd like to call my theory
>'Til Death do us part