Domain of Martial Agony

The caster of this spell must roll an attack roll against themselves with a weapon of emotional significance to themselves- the attack will always succeed. This may occur prior to engaging in combat. 

A 60-foot-radius silver sphere of visceral, targeted malice surrounds you. This area consumes the willpower and prowess of all those whose power is divined or otherwise earned. Within the sphere, all movement is halved. Both the caster and subjects AC is reduced by One every round unless they pass a constitution saving throw with a DC of 18. Every turn that the subject spends within the sphere they must make a constitution saving throw with a DC of 18 or their damage die for attacks that deal: slashing, bludgeoning or piercing is reduced by one (ex: D12 to d10) until the subject is incapable of dealing any damage. 

The caster of this spell is also resistant to the aforementioned forms of damage an effect that cannot be negated unless the casters concentration is broken. All spell attacks are casted at a disadvantage, and if one is casted successfully then the subject of the spell has their damage dice lowered by one until they are able to leave the sphere. Any spell or innate ability that allows the subject to teleport in any capacity— fails, lowering the subjects damage die in the process. 

Anyone outside of the sphere must make a constitution saving throw with a DC of 18 in order to enter, upon a failure the target takes 8d8 necrotic damage. Upon entry, unless specified they are also subject to the aforementioned effects.