I recommend getting it to 1/5 - not for the key, but for the Empire Treasures. The daily quests in WoD will give you *exactly* enough materials to get the Treasure. Each treasure = 200pts. towards a Linu's favor. After a week, you'll have enough for the favor - it's not much, but if you have nothing else to spend sigils / secrets on, it'll make getting the last boon (or two) faster.
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but you didnt gave me a answer of my question. what happend if i have 5/5? does anything change?