Phinis Gestor

 is a breton mage at The College of Winterhold in The Elder Scrolls V: Skyrim.

Location
He can be found in the Hall of Countenance, but can also appear in The Arcanaeum. He is the college's expert-level Conjuration master. During a conversation with the Dragonborn, he admits to practicing Necromancy.

Merchandise
Phinis sells the following Spell Tomes (All of which are Conjuration):
 * Banish Daedra
 * Bound Battleaxe
 * Bound Bow
 * Bound Sword
 * Command Daedra
 * Conjure Dremora Lord
 * Conjure Familiar
 * Conjure Flame Atronach
 * Conjure Frost Atronach
 * Conjure Storm Atronach
 * Dead Thrall
 * Dread Zombie
 * Expel Daedra
 * Frost Thrall
 * Raise Zombie
 * Reanimate Corpse
 * Revenant
 * Soul Trap
 * Storm Thrall

Related quests

 * Conjuration Ritual Spell
 * Lost Apprentices (Broken Quest): Phinis mentions that 4 students from the college, Yisra, Ilas-Tei, Borvir and Rundi have gone missing. However, the discussion doesn't create a quest entry in the logbook. After finding the students and their respective belongings, there's no dialogue option to inform Phinis of their fate.

Bugs

 * Sometimes he will not sell certain spells even when your conjuration is high enough. Waiting 48 hours to 1 game week usually fixes this problem (The master-level spells will not be available until the quest to obtain them is completed).
 * When fighting Ancano, Phinis sometimes goes into the Hall of Elements and begins fighting Ancano with his fists. When Ancano is killed, Phinis resurrects him as a zombie.
 * Upon giving Phinis the sigil stone for the master level quest he ends the conversation and won't reward the master spells(fix try to talk to him again).
 * Sometimes Phinis appears to disappear entirely. Different sources have reported finding him in various places for no discernable reason such as in the town of Winterhold, or trapped behind the gate of Winterhold College. Another place to check for him if he is missing is far below the college a few hundred yards outside the exit from the Midden. He has been found loitering in the snow fields down there and never leaving the area once he goes there.
 * Fix: You can attack Phinis or put something in his pocket to start a fight. Use Rally to force him to keep fighting while moving to some place near Winterhold. When near enough, some guards will intercept the Dragonborn. Pay the bounty. Phinis will be back to the College.