Not sure what its called but ther eis about 50 cosairs lv 15-20 and i always die just wondering if anyone would help me ? also what the best armour i could get
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You can get the max armor by going to Kamadan and getting a "ferry" to Consolate Docks for about 500g, then buy max armor there. If you don't do this, the best armor available would be (assuming you have Blacktide Den because wkdlush said Latenda Bog is where the quest is) Blacktide Den.
I usually skip the Master quests, since they're very difficult at low level, I would suggest, if you can't get any help here (which I'm sure you can) that you skip it and do it later on.