You speak a word of power that can compel a creature within range to sit down where they are standing.
If the target has 200 hit points or fewer, it sits and is considered prone for the spell's duration, otherwise, the spell has no effect.
This spell has no effect on undead or creatures immune to being charmed.   The seated target must make a Charisma saving throw at the end of each of its turns. If the target is a beast, it has disadvantage on the saving throw.
On a successful save, the spell ends.  

I SAID SIT.

  Ascended Spell. This spell costs 2 Spell slots to cast. A 4th-level spell slot and a 3rd-level spell slot.