I often see dragons ask for a root spell..How would a primal root spell work

To elaborate.

The spell root of the nature line a root comes out of the ground tangling the feet of the target
Ice shackles similar but with ice
Binding crystals encases the target in ice

What would a primal root do? How would it hold them in place and break in one hit (not that all roots do this)

Please post your ideas here.