I did this write-up over on the WotC boards for someone's character concept, but I think it could be a decent multi-class choice in the same vein as the Wizard of the Spiral Tower. (Also, it could use a name.)
Prerequisite: Wizard class, Arcane Implement Mastery (staff), Con 13+, Wis 13+
Ioun's Weapon (11th level): When wielding a Staff, you may make melee basic attacks, including opportunity attacks, using your Intelligence in place of your Strength. (Use your Strength to determine damage as usual.)
Radiant Defense (11th level): When you use your Staff of Defense encounter ability to negate an attack, the creature who attacked you suffers Radiant damage equal to your Constitution modifier.
Radiant Action (11th level): When you spend an Action Point to make an extra attack, this attack gains the Radiant keyword and deals extra damage equal to your Wisdom modifier.
Insightful Strikes (16th level): When you make a melee attack with a staff, you score a critical hit on a 19-20.
Staff Flurry -- Attack 11
Encounter • Arcane, Weapon
Standard • Melee weapon
Special: You must be wielding a staff.
Target: One or two critters.
Attack: Intelligence vs. AC (two attacks).
Hit: 2[w] + Intelligence modifier damage.
Effect: You gain a +2 power bonus to all defenses until the end of your next turn.
Staff of the Gods -- Utility 12
Daily • Arcane
Minor • Personal
Special: You must be wielding a staff.
Effect: For the duration of the encounter, or for 5 minutes, your staff deals extra Radiant damage equal to your Wisdom modifier on a hit or a miss.
Staff of Impregnable Defense -- Attack 20
Daily • Arcane
Immediate Interrupt • Personal
Special: You must be wielding a staff.
Trigger: You are targeted by an attack.
Effect: Negate the attack, and regain the use of an expended Encounter power.
Cheers, -- N