His True Face

You're one of the few Tibians who Armenius chose to actually show his true face to - and he made you fight him. Either that means you're very lucky or very unlucky, but one thing's for sure - it's extremely rare.

There's a small chance of getting this achievement during the mission 3 of the Blood Brothers Quest: if you're lucky, he teleports you to his basement when you leave his tavern after talking to him. This can also happen when entering or leaving the bar after completing the mission.