Speaking on a Bullshit Magic level, to give reason for some of that-
[McGuffin] is the item that, upon falling in to the wrong hands, may or may not have triggered the chain of events that led to Grimdark Future. Because of that, it has High Values Of Potentiality; it could be something simple, mundane, but because of the importance to the Grimdark Timeline it's essential to the spell. So, 'originally', the plan was to obtain the McGuffin and destroy/Do Something with it...
(Alternatively; something important to Timespace. Go get the Large Hadron Collider, put it in this tiny box, and get it back to the future, guys, have fun.)
...but because plans never go right, in order to secure this past as the past, the whole future-jump is necessary, too. Whether it be because the McGuffin is stolen or they need an 'anchor' of some sort to ensure things don't just readjust and go Grimdark anyway (or at least Completely Removing This Timeline From The Table- hey, future!Ravirn wouldn't want it at all)...reasons, basically.
It could also be because as it turns out, the McGuffin isn't enough, and/or they need some people from the present/past to trigger it as well.
I really like making up reasons for things I'm sorry guys /o\
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[McGuffin] is the item that, upon falling in to the wrong hands, may or may not have triggered the chain of events that led to Grimdark Future. Because of that, it has High Values Of Potentiality; it could be something simple, mundane, but because of the importance to the Grimdark Timeline it's essential to the spell. So, 'originally', the plan was to obtain the McGuffin and destroy/Do Something with it...
(Alternatively; something important to Timespace. Go get the Large Hadron Collider, put it in this tiny box, and get it back to the future, guys, have fun.)
...but because plans never go right, in order to secure this past as the past, the whole future-jump is necessary, too. Whether it be because the McGuffin is stolen or they need an 'anchor' of some sort to ensure things don't just readjust and go Grimdark anyway (or at least Completely Removing This Timeline From The Table- hey, future!Ravirn wouldn't want it at all)...reasons, basically.
It could also be because as it turns out, the McGuffin isn't enough, and/or they need some people from the present/past to trigger it as well.
I really like making up reasons for things I'm sorry guys /o\