This package contains the "descent into darkness" campaign for wesnoth: "learn the dark arts of necromancy in order to save your people from an orcish incursion." (expert level, 11 scenarios.)
battle for control of villages, using variety of units which have advantages and disadvantages in different types of terrains and against different types of attacks. units gain experience and advance levels, and are carried over from one scenario to the next in a campaign.