Can I play a plot card besides an overlord upgrade in the same turn?
The rule say that I can play one (and only one) overlord upgrade, but I think that the upgrades are monster upgrades, treachery and avatar upgrades only , because plots are in a separated par.
Otherwise, how must I play market when heroes are in Riverwatch? I am playing that if the heroes buy a treasure, I replace it inmediately (they have 5 treasure everytime). Is it correct?