When Ra Ah Ghul finanlly returned?
He was brought back to life by dripping Bruce blood on his corpse, and came back looking very much like member of the walking Dead, and in the end, gained his deon head power back, and was reborn as Himself...

He also claims to have seen the future when Gotham burns, and Bruce rises upo now as the Dark Knight!

Intersting that his power includes being able to see future events, and to be able to rreact to them!