You can use a bonus action to place a magical trap on the ground (20 ft range) in a 10ft radius, lasting 1d4 turns. All non-allies within the area needs to make a Constitution saving throw agains casters Spell DC on a failed save movement speed is half.

At 3rd level, the movement speed decrease becomes quarter movement speed.

At 6th level, duration increases by 1d6 turns, in addition any ethereal or invisible creature within or passing through your trap become corporeal/visible.