Originally Posted by Ph8te
As soon as Daario said Valar Morghulis I knew what was going to happen. He almost reminded me of the solider who helped Arya, who gave her a similar coin and told her to say those words so that "a man" would take her to the Faceless Men. He himself is most likely one of them which is how me killed the other 2 and disguised himself as an unsullied so well.
I think this is a bit of a stretch. Valar Morghulis was a common expression in High Valarian, like the Latin phrases today, habeas corpus, mea culpa, persona non grata, etc.. Several characters have used it. In this instance, Daario could have been talking about killing Dany.