Aamad

Aamad is royal mage at court of Ofieri king, very powerful sorcerer and leader of journey to the Northern Realms (Redania) precisely to Oxenfurt, also he is the one who wanted Verner (or Ferner or Perner), a former Aedirnian soldier to make them interpreter.

Hearts of Stone Expansion
But nothing go by his plans, when he and his soldiers (among them Annar) arrive, is too late for their prince and so he decide to at least bring his king a regicide Geralt of Rivia.

Later a mysterious Man of Glass appear to help witcher from struggles, he summon a storm that lead to unexpected landing near Novigrad. Geralt can but dont have to kill him and his wariors.