Hey there, I made up some stats for Tenser if you want to use them. I decided on focusing on his Transformation line of spells, according the wikipedia snippet there seems to be an awful lot of physical, self-boosting spells. He's pretty much a badass with wealth well over the average NPC (then again, he's not your average NPC). Tenser wields a flaming long sword in one hand and a staff in the archmagi in the other, can use a Quickened, Greater Tenser's Transformation as a spell-like ability from Archmage (see below). He has a lot of defensive spells memorized and I imagine he's a lot more paranoid in general after Rary's betrayal. The wizard's old and a little slow though, which can be fatal in epic duels. Stat block is my own, but should be fairly simple to make out.
Tenser
LG Human Transmuter 17/Archmage 5 (Middle-Aged)
HD: 22d4+132 (199 hp)
Move: 30 ft., Init -1
AC: 22 (+8 Armor, -1 Dex, +5 Deflection), 32 in Transformation
Saves: Fort +17, Ref +10, Will +23
Attacks: Long Sword +23/+17 (1d8+12, 19-20/x2, +1d6 fire)
Attacks (Transformation): +33/+28/+23/+18 (1d8+13, 17-20/x2, +1d6 fire)
SA: Arcane Fire, Spells, Spell-like Abilities.
SQ: Mastery of Shaping, Spell Power +2.
Str 18 (24)*, Dex 8, Con 17 (23)*, Int 28 (36)*, Wis 17, Cha 13.
Skills: 25 + ability modifier
Feats: Combat Expertise, Craft Magic Arms and Armor+, Craft Wondrous Item+, Empower Spell+,
Iron Will, Scribe Scroll+, Quickened Spell-like Ability (Tenser’s Greater Transformation),
Skill Focus (Spellcraft), Spell Focus (Evocation), Spell Focus (Transmutation), Spell Penetration.
Epic Feats: Epic Spellcasting
Combat Equipment: +5 Long Sword of Defending & Flaming & Spell Storing (Fireball), Staff of the Archmagi,
Bracers of Armor +8.
Equipment: Bag of Holding, Belt of Giant Strength and Health +6, Headband of Intellect +8,
Ring of Freedom of Movement, Ring of Protection +5, White Robe of the Archmagi.
*+5 Inherent bonus
Contingency: Antimagic Field if Imprisonment or Disjunction is cast at him.
Spells (CL 24th, DC 23 + Spell level, +1 for Evoc/Trans, +26 vs. SR):
Banned Schools: Illusion & Necromancy
9th-Foresight, Meteor Swarm, Time Stop, Wish
8th-Greater Shout, Mind Blank, Moment of Insight, Polar Ray, Polymorph Any Object, Temporal Stasis
7th-Delayed Blast Fireball, Ethereal Jaunt, Force Cage, Limited Wish, Reverse Gravity, Spell Turning
Archmage Abilities:
Spell Power +2: +2 to CL (-2 5th level slots)
Spell-like Ability: Use Tenser's Greater Transformation 2/day (Quickened automatically with the feat) (9th and 5th level slot)
Mastery of Shaping (6th level slot)
Arcane Fire (9th level slot)
Tenser's Greater Transformaiton, Trans 9: Same as the 6th level version but he gains +8 to Str/Dex/Con, +6 to Natural Armor and Fort saves, Proficiency with Simple/Martial Weapons, as well as Combat Expertise, Power Attack, and Improved Critical. The caster can dismiss this spell as a standard action.