Vesemir is a Character/NPC in The Witcher 3: Wild Hunt. One of the oldest Witchers alive, he used to be a personal friend and mentor to Geralt whilst he was being tutored in Kaer Mohren.
"Vesemir was the oldest living member of the Wolf School and most likely the oldest witcher of any school on the Continent.
About as long in years as the ruins of Kaer Morhen themselves and though eternally complaining about his creaky bones, this master of the witcher trade gave no thought to a well-deserved retirement. Gray but still spry, he continued to ply the monster hunting trade into his golden years - effectively, too, as he'd seen more beasts than all his students put together.
A harsh and demanding instructor in Geralt's youth, over the years he had become something of an adoptive father and mentor to the other witchers, always ready to help with sage advice and steady hands.
In the spring of 1272, when our story begins, Vesemir had joined Geralt on his search for Yennefer, trekking with him through war-ravaged Temeria."
- Vesemir is the oldest of the Witchers, one of the only surviving mentors and teachers. While a veteran and wise man, he was a mere combat instructor and as such he did not know how to create the mutagens needed to turn more boys into Witchers.