I was looking through curses the other day and it struck me that there aren't any curses that prevent a creature from moving. Sure, there is enfeeble to slow down a creature, but why not have a curse that restrains creatures the same way tanglevine or force hold do? And you could call it "paralysis"? The spell could have a timer on it (to prevent it from being OP) and would most likely have a cost proportional to the level of the target creature (just like how Sleep works).