With out giving spoilers, ill say that when you get to the shivering isles and their the final boss for the mages guild quest, or when you save the town from warewolfes only to find out the duke is one and he attacks his family - they, as end bosses, ARE HARD I do not think they were meant to be soloed. I am usually one/two/three shot killed by them and I am their level decked out in "quest gear" (gear you find on quests). I play as a templar, mostly focusing on experimenting right now with skills but I have some skills in the sun burst area and some in the alderic section. I mostly use two handed weapons and thee first two skills of that skill line, morphed.
I also ware medium to light armour (trying to be a templar battle mage) and These specific quests are for level 8-9, I am level 9 al most 10 and I fear I cannot do them till Im level 12-13, by then their xp and their rewards will be useless....
Is it me, or are end quest chain boss battles hard?