Elder's Square Vanilla

[humility]

So I was trying to farm some vanilla gear on my DK in Stratholm the level 60 one but you need to get The key to the city to finish the dungeon but to my surprise when I get to Elders Square where the boss that drops the key is the gate is locked either I'm doing something wrong or it's a bug?

[Zerrubabel]

Don't forget to clear out the ziggurats to open the gate