You can cast this spell only at night. You conjure an extradimensional dwelling in a range that lasts for the duration. You choose where its entrance is located. The entrance shimmers faintly and is 5 feet wide and 10 feet tall. based on the item you used for the ritual you may summon one of the following: 

one death knights, one lichs, or one Red Dracolich  adult red dracolichs. the summon acts at their own discretion and can listen to requests and commands by the caster. The being will remain there for 24 hours or until dismissed by the caster once the time has passed they return to the mauloseum and it disappears. Once the spell is resolved you will take 9d8 points of necrotic damage as a cost for tampering and altering the forbidden laws of life and death.