Board Thread:Spoilers!/@comment-10663213-20180310035130/@comment-25733960-20180316202630

Henry said that, but in that case Zeus would have returned Robin to land of the living as well, just like he did with Hook

The cristal was said to have enough power to kill a god. It's safe to say Robin's soul was obliterated.

If Robin returns I think it could a flashback, but how many flashback can they show in a 1 hour episode?