Ok, the idea came up while making my entry for the Spells & Systems Mini-Contest #16.
Although this spell isn´t as exciting as the Purge of Nature, i still think it´s a pretty nice idea.
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Rooting
The druid is able to invoke the powers of the nature whenever he wants. However, this allows him to summon a net of roots at the targeted position. While upholding the net, there will be a chance of 30% per second to root an enemied unit, standing on the net, for 0.50 seconds and 50 damage. The net becomes invisible for enemies after one second. The druid may uphold the net up to 5/10/15 seconds.

Changelog:
*Removed a bug reported by xxdingo93xx.
*Removed a little problem with looping sounds.

Keywords:
Nature, Roots, Root, Druid, Earth, Furion, Life, Plant,