Shulle: 1. Can't re-enter O'dims world to claim the Legendary venomous viper silver sword :( And no diagram for it..
2. If you choose Hjalmar, you can't explore all the "?" in the world due to to the one in Khaer Troldes basement (Place of power)
3. Respawning monsters appropriate to your character level, killed everything in the game that i can find, still level 69.
1. That is something that isn't broken in my opinion. It's the best sword in the game. If you blow your chance do get it during a quest you should be SOL. Also, you can find the console command for it if you are too lazy to go to an earlier save an redo it.
2. I was able to do both Cerys an Hajlmar quests and I don't think you need to do a quest to get the place of power. It's on the mountain up, not in the basement I think.
3. You are way over powered, but scaling monsters is nonsensical, Monsters don't get stronger just because some guy with white hair does. If you want enemies to scale, there is mod for that though. A lot of people don't like the game to scale with you the entire way. A lot of people do. Try the mod. Honestly if you really want a challenge even in death march at that high of a level no monster near your level will be much of a challenge. It would have to be like 15 level higher than you at least. Also try the mod, RANDOM ENCOUNTERS. They have difficulty settings, The highest makes monsters randomly appear at high levels and more than one at a time.