Try this, if you're crazy enough; Arngeir.

If you ever decide to take on this Greybeard monk, you're in for a surprise. Arngeir is, mathematically estimated, level 250; the highest level possible in the game, making him stronger than all of the bosses in game, combined.

Imagine taking on Alduin alone, backed up by a group of Giants, with maybe a Dragon Priest like Miraak or two. Throw in some Werewolves and you have Arngeir (or close enough).

My toughest enemy? I'd have to say a Mud Crab.

Arylos

Try this, if you're crazy enough; Arngeir.

 

If you ever decide to take on this Greybeard monk, you're in for a surprise. Arngeir is, mathematically estimated, level 250; the highest level possible in the game, making him stronger than all of the bosses in game, combined.

 

Imagine taking on Alduin alone, backed up by a group of Giants, with maybe a Dragon Priest like Miraak or two. Throw in some Werewolves and you have Arngeir (or close enough).

Idiot, that isn't an estimate

Toxikyle
Freakin' Miraak. You have to kill him FOUR TIMES! He's also at lvl 150. He's also immune to dragon shouts. He also has a badass tenticle sword.

He isn't level 150 unless you're close to that, because Miraak's level is... leveled his maximum is 150 which is tied with Arngeir (NOT the Dovahzul Dictionary app guy, the in-game Greybeard).

DovaKiinZaan

Ledgendary Dragon is mine-----I think that the Ebony Knight is MUCH harder, depending on what difficulty you are playing on...

werebear and i once used the wabajack on a chicken an it turned into a demon like thing

h̛̤͔ͣ̆͒͗ͪ3̧̳̗̤͖̺̼͖̆̈́̍͠ ̨̝͗͠ẉ͓͓̞̭͉̝̹̉̒͋̑ͦ̒̓̚h̷̴̜̩̱̞ͨͬͭͨ̐o̢̭̳̳̫͎̩̒͑̕ ̙͉͕͚̤̿͆͗ͨ͑ͮẘ̥͎̥͚̗̻̄͋̂͊A̝͚̻̬̯̻͉͎̎ͭ̈́͌̔͐̿̅͠i̱͍͇͔͗́͒ͨ͢͠ṯ̟̖̱͍̤̣̆̐̈͗̀ͤ̚͞s̶̳̦̪̗̝̹̦̙̑ͯ̓̉ͭ̊̏̚͞͡ ͇̫̪̟ͣͥ̂ͤb̩̤̺̬͓̝̅ͭͧ͌͌̈́͐̾̒̀̀͝ḛ̵̝͕̝̜͍͇͍ͣ̽͂́ͅH̶̼̘̘͌̾̋͊͋̇͟I̸̯̘̼̤̫͋̍̅ͮ̐N̵̳̳̼̬̲̖͉̅̈ͬ̀͠ͅd͔̦͇̠̃ͣ̏͢͠ ̭͖̬̳̖̞͒̌͛ͦͤ̇̽̚̚t̞̘͚͓͓ͯ͌ͫ̊͐̊̀͡ͅh̡͎̪̤̼͙͍̰̜ͬ̾̒ḛ̶̷̽͜ ͑̇ͭͥͪͯ҉͉̳̝̟̟̥W̧̪͕̞̯͕͇͔̯̊͒ͨ̃͛ͯ̋͑̚a̶̾ͫ͗͞ͅL̮͚̬͈̇ͯ̋ͭ̑̈́̄͞L̪̱̮̬̣ͯ̽͢ͅ

n̤̠ͭͩ͛̅̊e̩̙ͭ̃̃̕͜Z̾̏ͪ͒҉̥̞̩͎͔̟͎̳͘p͐̿҉̷͙̕ę̢̪̥͔̤̙̣̓ͮr̡̖͔̞̯͙͈͑̓ͤ͋͒͜Ḏ͈͈̯͙̱͑ͦ͛̕͢i͇̜̤̬͓͕͙͂ͮ̔͠â̸̴̾̎ͮ̈́̈́̾̋͏̖̬̬̰nͬ̐͏̛̞͙̻ ͓̱̖̣̝͖̬͆̂́͗̓͐̆̅͜H̨̞̪̮̜̼̹̲̏ͧ̈͊̀͆ͅi͖͚̱ͭ̍̓͗͑v͎̣̯͉̪ͧ̌̍Ę̥̘͙̘͕̏̎M͕͉̼͙͓̼͚̹̓̽͊̋iͫͬ̔͋̓̿̎̊͠҉̗͕̳̤̼͉͔̜n̶̟͓͇̳ͣ̄̌̾ͧ̄͐d̷̵̹͚̞͐

That.

Bloody.

Frost.

Troll.

You know which one I'm talking about. Alduin was a walk in the park, Miraak was irritating but killable, Paarth isn't too bad if you're able to ignore the name under his HP bar . . . but that frost troll. If you're anything like me you have about five armor rating when you're running up the Monahven, and that thing can 2HKO you while you're trying to whittle away at its massive HP, which regenerates over time. Grr. Must have spent hours on that thing before deciding to just run past it and come back in about thirty levels.

Archmages, they are the toughest enemies

they can defear Alduin, I watched a video.

For me,it is not an enemy,it is more than one enemy. Because I am playing on master from the beginning(except the dragons and other enemies I read above), the biggest pain in the @ss was always a group(2-3 or more) of magicians.. Either I found them out in the field or inside dungeons, I died like hundeds of times.

I found Harkon to be hard. I had the bow and the arrows to kill him with. A quarter of the way in the fight, I had to switch to dwarvern crossbow and bolts. Melee was harder to work with due to the lack of durabillity in a upclose combat situation.