Westwood Studios‘ 1993 RPG Lands of Lore: The Throne of Chaos is a Dungeon Master-like first-person, real-time action game with spells and combat and plenty of monsters out to end your life.
Las Vegas-based Westwood, coincidentally, were developers of the first two Eye of the Beholder games, but dropped the franchise in favour of developing Lands of Lore, their own IP.