Augustus's Sphere of Denial

The caster creates a magical barrier that forms a 15-foot radius sphere around them, when casting they may target up to six creatures, they are immune to the spells effects.

When a creature attempts to enter the Sphere, that creature must make a Strength Save, on a fail that creature takes 2d4 Force Damage and is unable to enter the Sphere. On a success, it passes through and takes no damage.

When a creature starts it's turn within the Sphere, it must make a Strength Save, on a fail it is ejected from the Sphere to the closest unoccupied space, taking 1d4 Force Damage for every 5 feet it is moved. On a success, it remains in the Sphere and takes no damage.