I made this Orc assassin level 56, while in master difficulty I was able shoot down a blood dragon with a sneaky arrow, killed an ancient dragon with one melee sneak attack and killed Alduin with two duel-wielded power attacks .
After that I just stopped playing Skyrim.
I had the same problem, being overpowered made it boring to me, so instead of striving for all combat related perks, I decided to do something about it. I deleted my lvl 45 paladin( A warrior that heals well/very Overpowered) and started a new. Basically I set some ground rules, no fast travel, no HUD, etc. I started Role playing basically, this got me more in-depth into the game, bascally percieving it as a different reality, kind of like reading a book but interacting with it. The only problem that I see now is, while my enemies take a realistic amount of damage (a few arrows and death) it seems that I take an unrealistic amount of damage. (multiple arrows to the chest) but maybe thats what I get for trying to percieve it more as reality then an RPG but thats ok I am aware of that problem and now can either up the difficulty and not spend so much perks in combat related trees or keep stressing about something unecesarry.
What I find as the key to keep this going and to take frequent breaks, what happens is you start to connect to the games reality rather then our own and you can notice all of the imperfections of the game.
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