Early lifeThe following is considered comics canon only and may contradict Andrzej Sapkowski's works.Mousesack was the son of an unknown man from Skellige[2] and Manissa, a witch in the service of Fregenal, who was killed in self-defence by Korin, the future father of Geralt. Mousesack's father left Manissa when he was a small child. Not knowing that the warrior killed his mother, the young Mousesack befriended Korin and the druid Visenna, who took him to the druid circle of Mayena.[3]
Even though the Mayena Circle was destroyed due to the plots of mages and kings, Mousesack and two older druids were invited by the king to a Witcher Tournament which was to take place in a special arena. When the tournament turned into a massacre of witchers of the Wolf School, Mousesack helped Geralt, his childhood friend, escape.[4]