>>535014582
>>535015456
I think chapter 6 is going to be the final dungeon. And chapter 7 is the continuation of the ending Gaster wanted in chapter 6.

Since chapter 5 is the last hunt for secrets (EGG and crystal boss), that means there’s no big explorations that could be done,

We have the Sky Mantle, which Eram will most likely provide in another side-quest.

Asgore has the black shard, a great tool to easily tear the Knight apart.

FRIEND would most likely be the secret boss of chapter 5 because the secret plot lines of chapters 1-4 end up to him giving the bosses their crystals.