The target ignores difficult terrain. Spells and magical effects can't reduce its speed or cause it to be paralyzed or restrained. It can spend 5 feet of movement to escape from nonmagical restraints or grapples. The target's movement and attacks aren't penalized from being underwater.
Using a Higher-Level Spell Slot. When using a 6th-level spell slot the duration is 8 hours. When using an 8th-level spell slot the duration is 24 hours.