Posted by: dragonslayer518
you need to park warthog by silo, don't blow up wraiths or it will not spawn or it will disappear, must be on normal or higher, and have to finish campain on normal in order for it to spawn.
You DO NOT need to finish the campaign first on Normal or any level of difficulty for that matter. It does have to be on Normal or higher, but you don't have to finish the campaign first. I do it on my first solo Legendary run and it works fine. You can destroy the first Wraith, but not the second one that is up on the granite slab near the door that you need to continue through.