Multiple Dust Devils?

[claudius 104]

The sacred wiki mentions that taking both recondition and elongate (is that right?) is overkill since you already can get a dust devil (DD) up whenever needed. So I will probably take spell shield (if I can get S installed right).. But the thought occured to me for a boss whether you could stack 2 clouds up? You can stack the dragon mage combat art with the blue hemispheres so it has precedent for a possiblity. Anyone? Oh and I am making a melee Dryad so it would be relevant to have DD clouds covering me.