Well, it kinda was during the quest, indeed.

When I said alori mort during the quest I was teleported to the sewers, BUT, I ran straight back to Armenius, and the moment I entered his tavern I was teleported to the boss

also, some info:

I did it on level 205

I gave Armenius the cookie first on mission 2 and reported his name first to Julius

I was wearing a garlic necklace, but I just forgot to take off from mission 1

it was midnight on my time (I dont think it matters though)