Pray I don’t alter the deal further...

You may retroactively alter a deal to change one element of it that the other party has to reluctantly agree to. This can increase the amount of reward you get, or alter an aspect of the deal, for example, if you make a deal to capture a fugitive alive you could alter it to let you kill them instead, and still receive the same reward. You may use this Ability whilst making the deal itself, or when you have returned with your respective part of it complete. The Mediator will judge if this alteration is fair, but it must provide you with some advantage.