Contract

You compose the contents of the Contract (it can be as simple or as complex as it needs to be) and present it to two willing individuals - the caster can be one of them.

For the contract to be in place both parties must verbaly confirm that they understand the contents of it before signing.

Both parties must sign the contract for the spell to take place.

The magic of the Contract lasts until one of the following conditions are met: 1 year passes, all conditions set by parties are met, it is dispelled, both parties brake the contract (noone suffers the consequences in that case) or both parites are dead.

The consequences of breaking the contract can be any punishment no more severe than:
Death: The Max HP of the individual that broke the contract is reduced by 1d6 each sunraise until his Max HP reaches 0 or the duration of the spell expires. The target feels no pain but is aware of this happening.
Suffering: The individual that broke the contract takes 6d6 non-leathal necrotic damage each sunraise until the duration of the spell expires.
Plague: The individual that broke the contract is posioned until the duration of the spell expires - additionaly the target can make a CON save (spell DC) during short rest to become immune to the posioned condition from the contract unntil next dawn.

The Contract can be treated as a Curse - it can be removed using Remove Curse or any Similar spell of the same or higher level than the Contract spell