Swordquest: Earthworld

The games follow twins named Tarra and Torr. Their parents were slain by King Tyrannus's guards, prompted by a prophecy by the king's wizard Konjuro that the twins would slay Tyrannus. The twins were then raised as commoners by thieves to avoid being slain by the king. When they go to plunder Konjuro's sea keep, they accidentally reveal their identities to him. The twins then start running from a demon summoned to kill them, but it appears that a jewel they stole attracts it. After smashing the stone to avoid the demon, two of Tyrannus's old advisers appear and tell the two about the "Sword of Ultimate Sorcery" and the "Talisman of Penultimate Truth." They are then transported to Earthworld.