This idea pretty much sprang from Virtue: It is in the interests of a Paladin to destroy evildoers, especially those who thrive in organized guilds such as Mae'Var's. But a Paladin cannot exterminate Mae'Var, because doing so would necessarily involve working for Edwin, who orders you to kill Rayic Gethras, which is a Virtue hit, which means instant Fallen Paladin.
Therefore, in the same vein as betraying Renal Bloodscalp, I suggest a Betray Edwin quest: When Rayic Gethras initiates conversation with you, you get a 3rd response option that indicates that you have been sent to kill him by Edwin Odessiron, but that does not mean you have to carry out that order. In the ensuing dialogue, you can negotiate with him a deal wherein you will bring him Edwin, and Gethras will pretend to be dead in the meantime--and also forgive you for killing his Mephits and Golems. If he accepts the deal, Gethras will Dimension Door away until you return.
Afterwards, when you have recruited Edwin, you can take him to Gethras's house under the pretense of scouring the place for any odd notes about Cowled Wizard activity that Gethras may have left lying around. Gethras Dimension Doors back in, and you can hand Edwin over to him....or even turn right round again and betray him, and help Edwin to kill him. (This approach will require some pretty fancy talking to keep Edwin in the party afterwards, since you A] Lied to him, and B] Went against his Lawful nature.)
If you have Edwin in the party for more than 2 days and don't go to Gethras's estate, he gets impatient and ambushes the party with a group of Cowled Enforcers.
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