Rough Accelerator build
Accelerator (Lv30)
"They may all look the same to you, but there are different kinds and different levels of evil. A first-class villain doesn't target honest lives."Human Cleric (Inquisition, Purification) 1/Monk 2/Warlock 3/Wizard (abjurer, fighter bonus feat) 3/Master Specialist 10/Eldritch Theurge 10/Archmage (Mastery of Counterspelling) 1
Feats: Arcane Mastery, Combat Reflexes, Divine Defiance, Improved Counterspell, Practiced Spellcaster [cleric], Practiced Spellcaster [warlock],
Reactive Counterspell, Spell Focus [abjuration], Spell Focus [evocation], Quicken Spell
Bonus Feats: Deflect Arrows (monk), Improved Initiative (wizard), Improved Unarmed Strike (monk), Skill Focus [Spellcraft] (master specialist)
Flaws: Frail, Pathetic Constitution
Epic Feats: Epic Counterspell, Exceptional Deflection, Infinite Deflection, Reflect Arrows
Invocations: Devour Magic, Endure Exposure, Fell Flight, Voracious Dispelling
Spells: Spellcaster's bane, ?
Equipment: Robe of arcane might [abjuration], Ring of arcane might, Starmantle cloak
Warlock dispel CL: 17 (capped to 20)
CL boosts: +1 (ring of arcane might)
CL boosts (abjuration): +4 (+1 Purification domain, +1 robe of arcane might, +2 master specialist)
CL boosts (dispel): +9 (+4 Inquisition domain, +5 master specialist)
Dispel CL = 31 (can take 10)
Accelerator
Azurin Cleric (Inquisition, Purification) 1/Monk 2/Warlock 3/Wizard (abjurer, fighter bonus feat) 3/Master Specialist 10/Eldritch Theurge 10/Archmage (Mastery of Counterspelling) 1
Feats: Arcane Mastery, Combat Reflexes, Improved Counterspell, Magic Disruption, Practiced Spellcaster [warlock], Reactive Counterspell, Soultouched Spellcasting, Spell Focus [abjuration], Spell Focus [evocation], Quicken Spell
Bonus Feats: Deflect Arrows (monk), Improved Initiative (wizard), Improved Unarmed Strike (monk), Skill Focus [Spellcraft] (master specialist)
Flaws: Frail, Pathetic Constitution
Epic Feats: Epic Counterspell, Exceptional Deflection, Infinite Deflection, Reflect Arrows
Invocations: Devour Magic, Endure Exposure, Fell Flight, Voracious Dispelling
Spells: Spellcaster's bane, ?
Equipment: Robe of arcane might [abjuration], Ring of arcane might, Starmantle cloak
Warlock dispel CL: 17 (capped to 20)
CL boosts: +1 (ring of arcane might)
CL boosts (abjuration): +5 (+1 Purification domain, +1 robe of arcane might, +1 Magic Disruption, +2 master specialist)
CL boosts (dispel): +11 (+4 Inquisition domain, +5 master specialist, +2 Soultouched Spellcasting)
Dispel CL = 34 (can take 10)
Infinite projectile reflection, infinite reflective counterspells (with CL high enough to laugh at most lv20 casters), plus wizard spells for all the random stuff he can do with his power.
However, you can only counter SLAs once per round and have no defence against Supernatural abilities or melee attacks. Starmantle cloak helps against the latter, but it needs fixing.
This was used as reference. And right now I'm questioning whether Voracious Dispelling/Devour Magic count as abjuration spells, but meh.
EDIT: Urgh, I could have just removed the warlock levels and given him an item of at-will CL20
greater dispel magic for 240,000gp - presumably "counterspells only" could get a discount, but that's ad hoc territory.