Druid is yet another game in Gauntlet style: top-down view, player runs around shooting an endless stream of monsters. Mostly, these games are set in fantasy environments. So is Druid.
Acamantor, some evil sorcerer, has summoned four 'demon princes' to help him rule the country of Belorn. The guild of druids sends one of their illustrious members to banish these powerful creatures: Hasrinax. They could have gone all together, and the quest would certainly have been way easier, but then, this game would have been pretty dull. So Hasrinax is on his own.