But to be a little more serious.....
The Raven Lord:
Bard (Lore) 18/ Warlock (GOO/Chain) 3
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Supernatural Powers:
Can conjure swarms with Conjure Animals
Has an extra level of Warlock than a lvl20 build would allow. He has a pact to himself because of this. He is both great and old (and has a voice like an evil Christopher Lee. Way eviler than our one). This gives him an extra invocation.
Telepathy works fine with Voice of the Chainmaster and inspiration die. The Imp works for a god. You'd better believe a voice like that is powerful, so any bardic effects can be done via imp proxy whenever wanted. He is the tiny, mini Solar Angel of a Bard God. So any voice effects really. Possibly right up to and including telepathic imp proxy persuasion done off the Raven Lord's skill bonuses. But mostly just bard effects.
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E.blast push, voice of the chainmaster, devil's sight as invocations.
Plenty of summoning, invis and charm related spells for the list choices. Teleports if DM fiat can't be used to start/stop encounters when required.
Gets all the awesome level 9 spells through magical secrets of Lore (wish, foresight and whatever you want). Can do anything (even melee) due to this. Has an invisible Imp to do his bidding. This imp can direct his hour-long swarm raids to anywhere within a fair few miles from his location, to simply destroy things when required. He can invis himself and make you suck incredibly badly at everything with cutting words and telepathy. This does not break invisibility.
Regularly just annoys you. Was that a branch touching your shoulder, or an invisible imp releasing a touch spell? Is that flock of bats a murder swarm, or just natural fauna flying back at dusk to its roost? Did you fail that roll because he was there? Are you hexed for the entire next day? Should you even get into the bathtub, or will 36 swarms of kippers immediately bite your softer bits off? Should you ever even go near a cliff?
He has such amazingly high charisma he tends to not be hated too much. But he could be anywhere. He could be doing anything. Did the bad guy succeed due to his inspiration? Or do you really just suck? Though, in all your misadventures, maybe he was there for you all along. Which side is he even on?
And the ravens warble, sing and cackle relentlessly. If you listen closely, you might just hear their secrets. Or they might peck your eyes out as you stupidly stand there and stare at birds. It's hard to say what the Raven Lord feels about anything. He apparently likes a good story though.....
I'll do a full build up tomorrow morning.