So if you all know there is a location in the DLC called "Castle Karstaag Ruins" and in it there lies a tough boss called "Karstaag" and after you get it's skull from "Glacial Cave" you have to fight him......and i bet a dollar some of you had no idea had to defeat him and had to rely on video walkthroughs and advice from other games.....here is the stuff you'll need to defeat him


You'll Need:
Slow Time Shout (All three words of the shout is require)

Dragon Aspect (All three words of power for this shout is ALSO required)

Stalhrim Armor and Stalhrim Greatsword (make sure they are Superior)---------> check around level 40+ and this equipment can only be found by every Blacksmith on Solstheim......but be warned it may be random stuff so you will have to go back and forth between Skyrim and the island or by leveling up

a follower that is essential and cannot die( I used Serana) -----------> the reason why is to use him or her as cannon fodder or a distraction


hope this will help

Weapon that does damage.
Lot's o' Health pots.

I've just described how to beat any enemy in Skyrim ever.

Personally after dying the first time, I just ran outside up the cliff to the left & shot him with arrows til he died.