Rumors have been circulating for decades that Blizzard attempted to develop an RTS based on Warhammer Fantasy or 40k franchise but the deal fell through and Blizzard had to develop the prototype further as their own IP and release the game as WarCraft or StarCraft. WarCraft 1&2 are set in a generic Tolkien-wannabe fantasy world so it is difficult to prove that they were inspired by Warhammer Fantasy. StarCraft, on the other hand, feels like a 40k ripoff with Terrans = Space Marines, Zerg = Tyranids and Protoss = Eldar. With SC2 it appears they were no longer hiding it, with Reapers and drop pods being blatant ripoffs of iconic Warhammer 40k units.
Why has Games Workshop never sued Blizzard over StarCraft?
Why has Games Workshop never sued Blizzard over StarCraft?