Ok so I am level 39 and I finished all of the available quests that I can access in grizzlehime there and there is still a area that I can't go to and and and well what do I doam very very sorry If just confused u, because I'm preety sure that the quest blood brothers is in there. and Im also using bad grammar.
You need to defeat Jotun first and then you go to Ravenscar. Blood Brothers is the last part of Grizzleheim. You need to be level 40 (I believe) in order to fight Jotun. (Take at least two or three other people to fight him.)