Well... Rudra learned something about the seeds... but still can't see the end game. I think Odin wants the queen destroyed. And Rudra is the only one that can make it happen... and in doing so.. the celestial will be forced back into the universe proper...
Honestly, I think Odin is kind of just using rudra as a pawn so he can fight the celestials and win. It seems like he’s getting fed power so Odin can see if his theory would work but I also think I’m completely wrong