Here we go, so they have passive abilities:
The Magister's Sigil (Su): The Magister, like almost all powerful mages, has her own personal sigil, but can use the sigil of the Magister as well. Any other creature that writes the sigil of the Magister in a permanent manner (as opposed to tracing it in the air or on sand) must make two Will saves (DC 25 each) to negate a
blindness and
feeblemind (respectively) that last for ten days.
Spell Immunities (Su): The Magister is immune to one spell each of levels 0 through 9 as if protected by a spell immunity spell. The spells are chosen when the Magister takes office and cannot be changed thereafter. She is also immune to all forms of magical writing (such as
glyph of warding, explosive runes, sepia snake sigil, and
symbol), and her presence does not trigger their effects.
Mind Blank (Su): The Magister is constantly protected by a heightened (10th-level) mind blank.
Mystra's Shield (Ex): The Magister is immune to all enchantment spells and effects and psionics, and gains +2 holy bonus on saving throws against all magical effects.
Spellpurge (Su). When the character becomes the Magister, all existing curses, charms, and other spells and effects placed upon her by other people are removed. The new Magister is also offered an immediate
teleport to a safe place where she can remain undisturbed for up to a tenday, learning more about the duties of the Magister. A new Magister is protected by spell resistance 50 and a
greater ironguard spell, although these protections fade after 1d4+3 months and nine days, respectively.
Spell Resistance: 20.
Skills: Because she can mentally draw upon a link to an archive of knowledge maintained by the deities of magic, the Magister gets a +10 circumstance bonus on all Knowledge (arcana) and Spellcraft checks.
https://www.realmshelps.net/monsters/templates/magister.shtml
Can Tezz beat all of these?