Board Thread:Questions and Answers/@comment-36492994-20180816230931/@comment-36492994-20180818210138

I think by season 7 all the threats had been eleminated except for the sons of garmadon which they resurrected garmadon.

Garmadon said he was the only thing keeping the oni away. I think he saw dead Oni in the departed realm who tortured him for mimicking there powers. However, I think the Oni we'll see in season 10 will still be alive