Ulrich had been a member of the Order of the Flaming Rose until Radovid V disbanded the group after using them and taking all their resources during the start of the Third Northern War. Those who remained loyal to Radovid were made witch hunters, whereas those who did not were exiled or thrown into jail. Ultimately, those who didn't join the witch hunters formed into a band of Fallen Knights, of which Ulrich became the grand master.
If Rose on a Red Field is completed: as his group prepared another shipment of fisstech, the witcher Geralt broke in to investigate and, on recognizing the witcher, Ulrich ordered him killed. However, this ultimately led to Ulrich's death.