Lumi's critfisher

??? Sorc-Pact Warlock|Avenger/Invoker/Student of Caiphon using Eldritch Blast as a RBA with Distant Vengeance, Sibling to the Stars to make Eldritch Blast radiant. Sorc-Pact for Mindbite scorn for +3d8 curse at paragon. Nabs Painful Oath for +Wis extra damage on top of it all.

Add AIP a Bloodiron accurate dagger for bigger crits and/or Two-Weapon Opening, Shadar-Kai Revenant and Reaper's Touch for extra shenanigans.

Feats go something like:

=Heroic=
Leather Armor Prof
Chain Armor Prof
Scale Armor Prof
Rod Expertise
Distant Vengeance
Divine MC
Implement Focus
Mindbite Scorn
Killing Curse
Dual Implement Spellcaster

=Paragon=
Sibling to the Stars
Two-Fold Pact
Painful Oath