This game tries to be like Diablo but different and succeeds and fails in different areas.
This game is not easy to understand. It appears to guide you but not really.
First if you haven't played the game, there is really only one class you should play: the battle mage. Second the game hints that you should get as many runes and read/eat them immediately. This is a terrible move as the more runes you eat the less you find. You have to decide your path ahead of time and only eat those and only level up if you absolutely need to (attacks only typically). Runes are for embedding in equipment for the most part. Third there are horses to ride. They give you more hp. They're fast. They're useless. Your attack speed goes way down and, at the beginning at least, you can't out run opponents on a horse. Which means they all gang up on you when you stop. Don't buy a horse; buy tons of healing potions.
The main object of the game is to build your character with the right skills, items and combat arts so he or she will kick butt. Explore the beautiful world. The world is very detailed like the world in Diablo with great graphics and sound design. The story is not great but it's mostly background so it doesn't matter as it's not central like in Diablo. At what the game does it mostly succeeds, at what it pretends to do it mostly doesn't. It lacks the polish, the story and the coherence of a game like Diablo.
Play it to build your great character, play it to explore the non-randomly generated world, play it to find all the items for your set. Forget the story, ignore the bugs and really pay no attention to what the game recommends you do, and you'll enjoy it.