Bloody Cage (Remnant)

You summon a sphere of jagged blood-spikes with a 1 foot thick wall, which is centered around a point within range. The radius of this sphere is equal to the hemomancy cost divided by 5 (rounded down to the nearest multiple of 5). Upon casting, you can choose either a sphere that pushes outwards or a sphere that pushes inwards. 

 If the sphere pushes inwards, it is transparent to those outside it but opaque to those inside it. If the sphere pushes outwards, it is transparent to those inside it but opaque to those outside it. Spells and attacks can cross the Sphere’s wall from the transparent side but not from the opaque side.

Creatures in the area when the spell is cast (when choosing the Push inwards option) or that attempt to pass through the wall of the sphere from either side must make a Strength saving throw or take 4d8 piercing damage, be pushed into an empty space away from the wall and be barred entrance. On a successful save, the creature takes half damage, is not pushed and can pass through the wall.

 If this spell is cast as a ritual, the duration is increased to Concentration, up to 8 hours.

 At Higher Levels

When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d8 for each slot level above 4th.