Crooked summoning

This spell summons the crooked man to kill up to 3 people for you, or do a certain evil task, within the lot of time. If it fails it's task then it teleports behind the caster and takes them to the the abyss where the caster is torchered for the rest of their lives. This automatically happens if it is an impossible task in the lot of time or in general.

The only way to dispell before the task is done or time is done a group of creatures are to recite it's poem with the number of people equaling the days left it has to completes it's task.(minimum of 2 people to recite regardless of days)

There was a crooked man, and he walked a crooked mile,

Then they tell the crooked man to go again on a crooked walk with a path way in the middle of the group. Then the crooked man will make a black door of darkness appear that goes a long road and tips his hat to leave. And never returns.

if you summon a crooked man that wishes only for silence they will smile their crooked smile and follow you until he can brutally murder you. Then you must say "smile your crooked smile no more, for the your soul seems to fall to your floor" And they will return to the realm from where they originated and stay for 100 years. If your a live in that time they will find you and punish you. 

Of you use a level 9th level spell slot it makes the duration into a crooked week (a year) instead of a crooked day (a week)