Snare
I encase your legs in a Snare of the ethereal.
This spell encases the target in Magic which traps them from Waist down. The target may not move nor turn during the duration of this spell.
An Enhanced Strength score of +4 or higher will allow the magic to be broken on a ten (10) count. (i.e. Breaking 1, Breaking 2, Breaking 3…) and an Enhanced Strength score of +8 or better will allow the magic to be broken on a five (5) count.
These counts should be at a reasonable pace of approximately 1 second per count.
The Magic in no other way harm the target.
If the target is unable to break or snap the magic they may still actively defend against a killing blow in the normal manner. Creatures which are actively breaking the magic may never be killed on a 5 count.