I think the third stone should be kept and lsot in a contrast to the others. How about an arrogant race/nation, which usually bullies it's "mortal" neighbours, and hunts down the nearby desperate and nearly-extinct Fremenish Orc clan (I think that Orcish culture should be Fremen-like (you know, the desert warriors from Dune))
just for the fun of it. And the Orcs rescue Thomas and Elena from the Undead, and the two flee with them from the undead and the arrogant race (some Elf-group, maybe? Anyway, I will call them Arogantese for now, whoever they are). Andat some point, the Undead and other forces of Vul'methor's attack Arogantese, taking over a stronghold after a stronghold, without the Orcs knowing it, when suddenly, Elena notices a few Arogantese warriors captured in an encampment, where they are tortured by Herichima, who is commanded to find out where the Arogantese hid the Third Stone. Elena reports this to an Orc commander, and he goes with her, and then says that it's his archnemsis who commanded the destruction of much of the Orcish Race, and that he deserves it.
Elena and Thomas then barely persuade him to save the Arogantese noble and his guards, and that hedoes, surprising and showcking the noble. The noble thanks them for saving hims life, and apolagizes for he has done in the previous years, and promises to lead them to his emperor. By that time, the imperial court is desperate enough to enlist the aide of "mortals", but their neighbours just reply that it is the punishment sent to them for their arrogance (that's kind of right, isn't it? I mean Daemon Killar has thought up this demon-led invasion, and he is a god of cinematics, and a god to the people on Felathas in the traditional sense of the term, as he has indeed created this world...), and that they don't care. And only then, Thomas, Elena, the noble and the Orcs arrive, and the Emperor quikcly lets them in, and quickly negotiates quick peace and amendments between his empire and the Orcs, but then they begin to disagree over the ceding of territory from Arogantese to Orcs, and the room is about to becoem the last battlefield between the two races, when Thomas and a young Arogantese mage notice that the Undead and the monsters never seen before storm through from the crypt, while Fellhounds and the Dreadlors invade from the other side, while Vul'methor summons the Arogantese warriros of old into Revenants, his new elite unit (Arogantese skeletons+magic+enchanted mithril armor+enchanted scary weaponry=Scary New Shock Trooper for Algor) with a few eager Necromantic students. The Orcs threaten to withdraw, and Emperor is forced to meet all their demands. And so in the throne room, the two ancinet enemies go to war. The first skil lbelongs to Thomas, as he tries to hide from the undead but slips and smashes a skeleton. He then is forced to evade both friendly and not-so-friendly fire, when he is apporached by a Dreadlord who tries to, for some reason, recapture him, but is shot dead by Elena, who joins the ranks of Arogantese archers. Thomas then runs to the throen room, while the Arogantese engage in a deadly melee. Then, when they begin to falter, the Orcish leader lets out a warcry, and the Orcs charge, showing incredible skill, while Arogantese rely on magic and enchanted weapons. An Orcish Champion leaps into the air, and lands smashing a skeleton and cutting a Revenants into pieces. The Arogantese noble unsommons a huge amount of undead in a massive effect of Holy Light. The Orcish leader hurls his storm bolt at a Dreadlord, killing him.
After a climatic battle, Orcs and what's left of the Arogantese, along with Thomas and Elena escape. The noble who led the Orcs there is dead. They begin to plan what to do...
