So It Begins is a main quest in Kingdom Come Deliverance 2, heavily focused on combat. As enemy forces approach Suchdol, it's up to Henry and his allies to take control and defend the fortress from being taken control of.

To complete Osina’s request, go to the privy next to the combat arena that you visited during the Opus Magnum quest, then interact with the stalls to reveal the demons. Since it just looks like a loo to you, go back to Osina and he sends you off again to investigate a mysterious door on the Maiden side of the tower.

Warhorse Studios promises it will soon share details about how players will be able to 'create, tweak, and expand your medieval adventure.'