Last night my group played WotR 5-1, Audience with the Inheritor. For weeks I gleefully awaited my group's surprise and struggles against an ambushing non-combat 70 check.
That is, until the player with Mythic Champion used one mythic charge, negating the good Lady's additional 50.
The difficulty of the check to defeat is increased by 10 times the number of characters.
Then you may expend 1 or more mythic charges. If you do, ignore effects that increase the difficulty of the check.
So now he was rolling a d20+10 by himself against a 20. With the extra d12's from Heaven the roll was trivial.
So, was this legal? If so, it's not really an edge case, as most parties with a physical attacker will have a Champion. I guess you could say we got lucky that the random character that had to fight Lady of Valor was him, but still. It made for a very meh ending to what I hoped would be an exciting start to deck 5.
Yes, this is correct. As you say, since a random character has to fight her, you could have ended up with someone rolling a d4, depending on party composition. It's the luck of the draw.
That is legal as long as the character is attempting either a Strength or Dexterity check (note that Lady of Valor has Melee as an option, so if one has the skill Melee: Strength then that would count).