The story begins a thousand years ago, when six demons ruled the world. A hero and a warlock overthrew their reign and cast their souls into the Well of Souls. The demons have survived and escaped so your hero must tread the path of the warlock and banish the demons once more. Soulbringer's story is split into eight main parts, with the character needing to complete a certain set of tasks before moving on to the next. The player has flexibility in how and in the order in which the tasks are completed.
Tertiary quests are simply fun extras that have no relation to the main game.
This in itself should improve replayability of Soulbringer's forty-hour story. Luckily, your uncle is a magical being that will teach you some initial powers. As Ars Magica has influenced Soulbringer, it is unsurprising to see that the magic system is well developed. Not only will there be various standard spells, but also more esoteric magic working at a subtle human level, manipulating emotions and minds. Each sphere has strengths and weaknesses.