The two shadowy figures are non-player characters featured in a cutscene during the Darkness of Hallowvale quest. They are werewolves hunting humans to appease the blood tithes of House Drakan. Extremely little is known about these figures, and they only appear once in the game. A player can only see these figures once in the cutscene, and they can never be seen after that. It is currently not known how the two Shadowy figures got past the Holy Barrier and into Silvarea, as they are werewolves and wouldn't have been able to pass through the barrier.
The Shadowy figures.