Add the following rule:

Any time in the game, a mortal may propose a “Deal with the immortal” (these four exact words must be used). This cannot be used as a supertask. This deal can only involve anything that the mortal has in their status. For instance, a mortal may offer 10 health in exchange for 10 energy points. Any deals are proposed in the GNDT. Only the immortal can accept deals and set them in motion. If any deal is too vague, the immortal may choose among different acceptable interpretations. Any mortal may only have three proposed deals at one time. If the Immortal does not reply to a deal 72 hours after it is proposed, it is failed (freeing up another possible deal) and the mortal cannot propose the same deal for 72 hours.