Gestaf

 is an Allowak yeti the Mighty Nein and Dagen Underthorn encountered on the island of Foren in Eiselcross. As an NPC, is played by Matthew Mercer.

Appearance
Gestaf is, like his compatriots, a tall but squat-looking humanoid figure with thick, coarse, white hair all over his body, except for the hands and face, which are bare skin of a dull grey, almost blue, color. He is noticeably taller than his 10- to 12-foot tall fellow yetis, however, a "hulking behemoth", and he carries a giant, jagged hook spear. His eyes glow with a piercing, light blue rage when he fights and especially when he uses his Chilling Gaze ability.

Background and personality
Because so many people from the Balenpost end of the island come to Allowak territory as poachers and have killed a few yetis rather than talk, Gestaf has learned to attack first.

Gestaf and his fellow-yetis ambushed the Mighty Nein and Dagen, but as the fight went very poorly he surrendered—though he almost restarted the fight when Caduceus, having been turned into a mammoth and rendered uncomprehending of surrender, knocked his fellow yeti unconscious; fortunately, Yasha brought the yeti back to consciousness with her aasimar healing.

After the fight was over Gestaf shared information about Lucien and his group. He also agreed to guide Mighty Nein toward them. At the end of the day, all the yetis were invited into Widogast's Nascent Nein-Sided Tower for dinner and a place to sleep.

Abilities

 * Chilling Gaze: On a failed Constitution saving throw, the target creature is paralyzed for one minute or until it makes its save. After the creature makes the save, it is immune from further gazes.
 * Sweeping spear attack (multiattack?): Attacks multiple creatures in his 10-foot reach.
 * Immune to cold damage

Notable Items

 * Giant, jagged hook spear

Quotations

 * Gestaf: If you can promise not to cause any trouble or to share this map and knowledge of the Sanctuary, we can... we can carry along with you for the day and keep an eye out. Watch your backs as you watch ours.