Forget abou Thor, I gave him a hint, but i won´t tell him a major spoiler. This is definitely the best sword so a character before level 30 should not wield it for balancing issues.
who says i'm not level 30 or better, but i dont want you to spoil the game for me so dont tell me anymore than you already have. also what i did to get to quite a high level is wandering around killing everything you see which isnt an npc. i explored about 2/3 of the map before i joined a guild and then found there quests easy. but to do this you will need some good equipment and the easiest way to get some is to steal it. for example go to ghost gate and steal the whole set of glass armour (not the sword it is aweful) and then steal a nordic clamour and your ready to reep havoc. i think you'll need about level 30 or higher sneak to steal the glass armour (with a few loads!) because the shop keeper is well close to you. hint make sure he's not facing you by standing in front of him and have him say something at you then walk behind him.