You don't get a key from the calus chest. The milestone reward for the raid is what drops during the raid. There is no extra reward that you pick up from the tower after being the raid.
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Oh. Well I don't remember getting anything at all.. None of us did. But I could be mistaken I guess.
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From the whole raid, nothing? How many times have you completed it this week on that character?
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That was the first time. I did go through again to finish my Acrius quest. I didn't get a drop when Calus died, we waited to revive and went to the chest.
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You ran it again this week to complete the acrius quest? You only get rewards once per week per character from the raid.
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I got the Legend of Acrius quest last week. This experience was my first run through/completion of the raid this week on that character.