You are at the end of act 1, with 2 ways to leave. One method is to take the stairs by Samuel's lair, and the second (which gives experience points) is to
blow up the forge.
There are quest opened doors in the citadel, which you can only get past if you put on the citadel armour as a disguise when you entered. Killing everyone first you would miss these, though there are no essential quest rewards or loot in those areas.
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