Contract

The signer magically contacts a demon through a hell portal. The contract can be rushed or if written incorrectly will allow loop daemon to control them. The caster if a contract is signed will gain abilities in the form of a  total of spell slots equal too 18 the more powerful the daemon ( at the DM's discretion ) the more total spell slots.  You will need to make a flat intelligence test  of 18 or if the spell has been cast before 15 wisdom check  or the daemon will be able to manipulate you to do what they want. You can only cast this spell once per decade.