You can train Mysticism in Oblivion (and Oblivion Remastered) from several NPC trainers, depending on your current skill level. Here’s a clear breakdown and some quick context.

Where to Train Mysticism in Oblivion

Apprentice trainers (skill 0–40)

These are the easiest to access and don’t require guild membership.

  • Angalmo – Chorrol Mages Guild
    • Found inside the guild hall in Chorrol.
    • Can train Mysticism up to 40.
  • Druja – Skingrad Mages Guild
    • Located in the Mages Guild in Skingrad, on the northwest side of town.
    • Also trains Mysticism up to 40.

Journeyman trainers (skill 40–70)

These pick up once you reach 40 Mysticism and can take you to 70.

  • Boderi Farano – Mystic Archives, Arcane University (Imperial City)
    • Inside the Mystic Archives area of the Arcane University.
    • You need full Arcane University access (complete all Mages Guild recommendation quests).
    • Trains Mysticism from 40 to 70.
  • Ita Rienus – Bravil Mages Guild
    • Located in the Mages Guild on the west side of Bravil.
    • Trains Mysticism from 40 to 70 and does not require guild membership.

Master trainer (skill 70–100)

Once you’re 70+, you can unlock the master trainer.

  • Dagail – Leyawiin Mages Guild
    • The Wood Elf mage in the Leyawiin Mages Guild.
    • To get her to train you:
      • Reach at least 70 Mysticism.
      • Get a recommendation from either Boderi Farano or Ita Rienus.
      • Have closed at least three Oblivion Gates (you can check this in your journal).
    • After that, she can train Mysticism from 70 to 100.

Quick reference table (HTML, as requested)

Skill Range Trainer Location Requirements
0–40 (Apprentice) Angalmo Chorrol Mages Guild None, guild membership not required
0–40 (Apprentice) Druja Skingrad Mages Guild None, guild membership not required
40–70 (Journeyman) Boderi Farano Mystic Archives, Arcane University (Imperial City) Full Arcane University access (all recommendation quests)
40–70 (Journeyman) Ita Rienus Bravil Mages Guild None, guild membership not required
70–100 (Master) Dagail Leyawiin Mages Guild Recommendation from Boderi or Ita, plus at least 3 Oblivion Gates closed

Tiny “quick scoop” story-flavor

You start as a scrappy apprentice, bouncing between Angalmo in quiet Chorrol and Druja in wine-soaked Skingrad, spamming Detect Life until your head spins. Once you prove yourself, the Mystic Archives in the Imperial City open their doors, where Boderi Farano and Ita Rienus sharpen your senses even further. Finally, after closing fiery Oblivion Gates and bringing back tales of survival, you stand before Dagail in Leyawiin, who teaches you to bend souls, senses, and reality itself. Mini TL;DR:

  • 0–40: Angalmo (Chorrol), Druja (Skingrad)
  • 40–70: Boderi Farano (Arcane University), Ita Rienus (Bravil)
  • 70–100: Dagail (Leyawiin, 3+ gates closed + recommendation)

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