Showrunner Marc Guggenheim sure knows how to tease fans, as he posted an image from season 3 of Arrow stating that it was part of the "mystery" set for the finale.

Ra's Al Ghul Could Die In Season 3 Of Arrow

It looks like a massive digitized pod, or the inside of some cargo plane, but little else can be made out from the picture, which Guggenheim posted on Twitter on April 16. Speaking to Entertainment Tonight, Guggenheim revealed that Ra's al Ghul (Matt Nable), Nyssa (Katrina Law) and Oliver (Stephen Amell)g would feature in the scene from the finale titled, 'My Name is Oliver Queen,' on the set.

"Right now there are no plans for it to play beyond [the finale]," he hinted. "There's a fair amount of green-screen work to make it work, and the scene that we shot featured Ra's, Nyssa and Oliver."

This most likely ties in with Oliver making his final decision about the offer that Ra's al Ghul laid out before him.

It has been strongly rumored that Oliver will be turning over to the dark side and taking Ra's al Ghul on his offer to join the League of Assassins. The synopsis for the next episode of season 3 states that Oliver will "go through a rigorous transformation." Could this be to make the transition to the dark side?

The next episode, titled 'Al Sah-him' will air on April 22 on The CW.

Watch the preview for the upcoming episodes here:

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Arrow, The cw, Television