Realms of Arkania: Shadows over Riva (German title: Das Schwarze Auge: Schatten über Riva) is a computer role playing game based on the German RPG system Das Schwarze Auge by Attic Entertainment Software. The original German version of the game was released in 1996. Sir-Tech released the English version in 1997.
Shadows over Riva picks up where the party left off in Realms of Arkania: Star Trail. After uniting the Dwarves and Elves, the party stops by the harbor city of Riva which currently under siege by the orcish hordes. The city is on edge. The countryside's once lucritive dwarven mine has been decimated and occupied by the Orcs after a string well coordinated attacks. Inside the city for some unknown reason the magistrate refuses to recognize the threat the Orcs pose just outside the city gates. Meanwhile rumors abound of traitors in the slum ridden Hoberkian community and strange corpse disappearances within the city's graveyard, the Field of Boron.
As the party investigates each lead, more questions seem to surface than answers. After penetrating the dwarven mines the deviousness of the traps suggests that the Orcs have somehow become much smarter and more organized than normally possible. No longer are they fragmented tribes warring among themselves. They speak of a single, wise all powerful chieftain with the powers of a wizard. Upon confronting the chieftain deep within the mines he summons a massive demon from the underworld to fight the party. This alone is extremely unusual as orcs have never had the intelligence required to master magic, let alone the skills of one of the most powerful wizards. Since this has not been the only time the party has fought summoned demons, the party manages to kill the demon sending it back to the underworld. Upon killing the orc chieftain, a tiny worm emerges from chieftain's head and flees.
Returning to the city with this new information, the party still finds the city's magistrate apathetic. They befriend the Holberkians when they save one of them from a mob. Far from the traitors they had been painted, it turns out the Hoberkians are faithful friends. Being half Elves and half Orcs they have knowledge of the Orcish hordes, earning the enmity of the city which thinks they are responsible for the Orcish siege of the city. They too have noticed a pronounced change in the Orc's activity, suggesting an outside influence. They reveal a long absent sorcerer living on an island in the swamp who could have been responsible for the changes in the Orcs.
The next day one of the Hoberkians rows the party to the sorcerer's tower. There the party finds numerous experiments and letters all pointing to a person known only as Borborad and his shipment of two worm queens. One queen was delivered but a second was lost enroute when the urn sank with a cargo ship in Riva's harbor from a storm. Research notes further reveal a wealth of information on the worms spawns from the queen. They possessed extreme intelligence and could possess hosts by entering their brains through the nose. They were also linked telepathically to the queen who spawned them and could not be killed unless you killed the queen who resided within a hive which was invincible to attack due to the queen's magical spells.
After returning to Riva the party speaks with the magistrate about their suspicions. Instead of immediate action, the magistrate simply dismisses the group. Within the day they are framed for murder. It is at this time that an underground movement contacts the group and offers them sanctuary as well as the use of an underground tunnel system that surfaces in every temple They are informed of the underground's suspicions that the magistrate is under some unknown influence, possibly a worm spawn. If so, it would explain the framing of the party of murder as they know too much and are a threat to exposing the entire plot.