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Having it instanced makes that final grind for 120 a completely isolated experience it just seems silly.

I’m guessing there’s some technical reason for it but still

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over 4 years ago - /u/JagexRyan - Direct link

The forge is only supposed to be a personal instance while you're completing the mystery. After that it'll be a shared instance in which you can see other players too.

However, it sounds like this isn't currently working as expected. I'm going to look into it tomorrow.