Shor is the Nordic aspect of Lorkhan, who is an Aedra. Aedra are not anymore good than the Daedra, but they're existence and power is dependent on Nirn and worship of them.

Basically, Lorkhan/Shor tricked some of his fellow spirits to drain some of their energy and use it to create Nirn. Some escaped, such as Magnus, who originally constructed Lorkhan plan of trickery. Though, Magnus was still significantly drained to the point where his essence became magic, and since he is not bound to Nirn, it defies natural laws. So basically, every time you use magic, Magnus is running through you. Also, when Magnus was escaping, the tore a whole in the fabric of Oblivion, making a gateway to Aetherius, also known as the sun.

The are to theories for who the actually physical part of Nirn was made, either Lorkhan sacrificed himself, or the other Aedra killed him. Either way, he became the physical world of Nirn. The other Aedra were drained of power and bound to Nirn, and now depend on worship to keep their power up, so, they really aren't any more good than the unbound Divines, the Daedra. But they have to be nice in order to get power, their real goal is to leave Nirn, and Lorkhan is fighting with his spirit (through embodying mortals to stop them, such as Tiber Septim, Pelinal Whitestrike, etc) as their disattachment would collapse Nirn.

The Elves hate Lorkhan because they think that they are descendents of the Aedra (while they are, as are man, but they aren't direct descendents, since they were created, not birthed) and that Lorkhan robbed them of the godhood they would have had.

And that's a very, very brief summary of the Divines.


Also, it's stated by many of the residents of the Hall of Valor that Shor's pure presence can blind mortal eyes.