In Oblivion (and Oblivion Remastered), you buy most Illusion spells from regular spell merchants, with the best ones coming from the Mages Guild, chapels, and the Arcane University.

Main places to buy Illusion spells

  • Mages Guild halls (all major cities) – Almost every city’s Mages Guild has at least one vendor selling Illusion spells (light, charm, calm, etc.), and they refresh as you level up.
  • Great Chapels of the Nine – Large chapels in the big cities often have spell merchants who also stock a few Illusion spells alongside Restoration and other schools.
  • Imperial City – Market District
    • Edgar’s Discount Spells – Sells cheaper, lower–mid level spells from various schools, including Illusion, which is handy early on.
* **Mystic Emporium** – Another spell shop in the Market District with a wider selection and access to stronger Illusion spells as you advance.
  • Arcane University (Imperial City) – Once you join and gain access, some of the strongest Illusion spells in the game are sold by the mages near the spellmaking altars and in the Chironasium.
  • Bravil Mages Guild – Especially good for Illusion: NPCs there are known for selling high–level Illusion spells like Chameleon and powerful crowd-control spells.

Master‑level Illusion spell vendors (late game)

When your Illusion is high enough, master‑level spells (like very strong Invisibility, Chameleon, and crowd-control) are sold only by a few specific NPCs.

Here are the key master Illusion vendors and where to find them:

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Vendor Location Notes
Ita Rienus Bravil Mages Guild Specializes in high-level Illusion; great source for strong Chameleon/Invisibility–style spells.
Aurelinwae Mystic Emporium, Imperial City Market District Sells powerful spells from multiple schools, including master Illusion.
Gaspar Stegine Arcane University One of the mages near the spellmaking/enchanting areas, selling very high-level Illusion spells.
Raminus Polus Arcane University Important Mages Guild figure who also sells strong spells, including Illusion.
Kovan Kren Dunbarrow Cove Associated with that lair; offers master-level Illusion magic once you have access.

Quick tips for building an Illusion mage

  • Join the Mages Guild early – That unlocks more vendors and eventually the Arcane University, where the strongest Illusion spells are sold.
  • Shop around every city – Different merchants stock slightly different Illusion spells; doing a circuit of the guild halls and chapels often fills out your spell list fast.
  • Train and then buy big spells – Master–level Illusion spells require a high Illusion skill, so it helps to train or grind cheaper spells first so you can actually cast what you buy.

In short, if you’re wondering “Oblivion where to buy Illusion spells,” the best loop is: city Mages Guilds → chapels → Imperial City spell shops → Arcane University and Bravil once your Illusion skill is higher.

Information gathered from public forums or data available on the internet and portrayed here.