Leyawiin Mages Guild (Sells Greater and Superior Soul Trap).
In The Elder Scrolls IV: Oblivion , the spell belongs to the school of Mysticism and can be purchased primarily from various Mages Guild halls throughout Cyrodiil. Where to Buy Soul Trap oblivion soul trap spell buy
The most reliable source for a standard Soul Trap spell is in the Chorrol Mages Guild . Other vendors across major cities also stock different versions of the spell based on your skill level: Apprentice Level (Mysticism 25+): Alberic Litte : Chorrol Mages Guild. Druja / Sulinus Vassinus: Skingrad Mages Guild. Alves Uvenim : Leyawiin Mages Guild. Delphine Jend: Bravil Mages Guild. Ungarion : A Warlock's Luck in Bravil. Journeyman/Expert Level (Mysticism 50-75+): Leyawiin Mages Guild (Sells Greater and Superior Soul Trap)
The standard Apprentice spell costs roughly 60 Gold to purchase, though higher-level versions like Legendary Soul Trap can cost up to 810 Gold . Other vendors across major cities also stock different
Single-use Soul Trap scrolls can be found in random dungeon loot or purchased from general magic vendors.
If you need to raise your Mysticism quickly to use the spell, many players recommend spamming a cheap spell like Minor Life Detection , which can be bought at Edgar's Discount Spells in the Imperial City.
Mystic Emporium in the Imperial City Market District (Expert level). Master Level (Mysticism 100):