Does damage marked on units get cleared during the showdown phase, even if those units are not participating in the showdown?

Ruling: All marked damage is cleared from all units on the board during the showdown phase, regardless of whether they participated in the showdown or their location.

Sequence:

• Use an ability (like Challenge) to mark damage on a unit
• Start showdown with a different unit
• During showdown, all marked damage clears from all units (including the first unit that didn't participate)

Nuances:

• Location does not matter - units in BASE, COMBAT, or any other zone all get their marked damage cleared
• This applies even if the damaged unit never entered combat