Ra’s is known for his Lazarus Pit, which can also raise folks from the dead, beyond granting other restorative properties, as well as all-around immortality.
Ra’s al Ghul coming to Gotham is extremely interesting, considering the Fox drama started its run as a relatively grounded series.
The plots and characters have grown increasingly weirder and wackier, of course, with Hugo Strange’s already introducing the concept of resurrection.
Not the Pit, nor any of the villain’s other supernatural powers, were mentioned in DC’s announcement, but they won’t likely stay hidden for long, if at all.