As near as I can see, rules as written, people with 0 honor can still stake honor. I can't find anything that says otherwise, and you can still lose honor at zero, it just doesn't take you below 0. I'm clarifying because it looks like clashes are critical to the threat of the game, and I want to make sure that I'm reading it correctly that a Shadowlands creatures can issue challenges to start a clash. It would be weird if PCs practically feared human opponents more than ogres. I checked, and the deadliness of their attacks doesn't seem any higher, as if they were adjusted to rule out clashes as an option.
Anyway, thoughts?