Deluge, Volcano, Violent Gale?

[Aaronock]

Only one field per sage at a time. If you had another sage cast volcano over any cells of say...deluge...it will overlap with volcano.

However you don't have to be in its area of effect to get the free gem cast again as long as the duration of the field is up.

So example: I lay down Deluge 5. During the first duration of Deluge 5 (which is 5 minutes) and I'm on the same map I can recast deluge anywhere on the map for free as long as cells of it are still available (such as using it for Waterball). I can't really explain it better than that, so hopefully that answers the question.