Portraits revealed through your current reading position.
Someone Carl made a promise to, one he believes he cannot keep without the Gate of the Feral Gods.
When Orren demands that Carl surrender the Gate of the Feral Gods, Carl's first panicked thought is not about his own safety. He thinks: goddamnit, I needed that gate — how could he keep his promise to Juice Box without it?
The promise is what makes him stall for time, ask about the liaison who helped the Skull Empire, and finally demand a lawyer rather than hand the artifact over.
The reason Carl refuses to give up the gate.
Also appears in books you've already read — spoiler-safe to their endings: