Draw the topmost Solo Enemy Card and assign it to the leftmost Hero Slot at the bottom of the Capital City Board. That action will be performed by that Hero. The Enemy does not have a normal Action Bar like you do, so the Solo Enemy Cards and the Hero’s card slots act as the Enemy's actions.

If the Enemy is able to perform the listed action by meeting its requirements, they MUST do so. However, if they cannot because of insufficent Resources or lacking a necessary requirement, it is considered a “Failed Action.” Instead that Hero performs a Move Action (see Moving a Hero if an Action Fails).

Whenever there is a single Solo Enemy Card in the deck, instead of drawing it take that card and ALL cards in the discard pile (not cards in Hero Slots) and shuffle them together. Place them face-down to form a refreshed Solo Enemy deck.