True King's presence

With an open Grimoire the user dramatically increases the strength of gravity in an area in front of them. Any objects in the area are slammed into the ground. It is capable of stopping a large projectile, bending magical light, and snapping trees in half, but cannot affect Anti Magic attacks, nor cause any direct harm to any living creature
 those hit must make a strength saving throw, upon failure targets will remain stunned on success they are relieved  of the spell effect, creatures of medium to large size that have twice as much or more mana than the caster are not stunned but have their movement slowed by half