The contract is to turn ones back on the guild and join late in the war. The contract is only valid upon completion of killing one or more Guild members through the war. If one, whom accepts the contract, is unable to kill their target or is killed in battle the contract becomes void.

In order to obtain something crafted by myself I will require one head suplimented by this war from the one who has accepted the contract.

If further proof is needed of what I can create, simply look at Ryouko. While is not the best at describing or distributing his character sheet, I designed the entire character for him essentially save an ability or two.