Ok, here's my $10.02:
Love the concept. Could make for as interesting a game as a possessor is now. There are some changes I would make, though...
First off, I voted for different name altogether. If it were me, I'd name the class something akin to "Reaper" or "Soul Harvester". Both retain the element of evil that Gerbil is looking for. And come on, who wouldn't want to be a Soul Harvester?
Second, hear me out on a suggestion for the implementation. For those of you familar with the Elder Scrolls series of RPGs (Morrowind, now Oblivion, etc.), there is a concept of a "soul gem". Follow me down this road...the character would start off with an array of soul gems whose "capacity" is rather limited (i.e. a "weak" or "petty" soul gem). You could either make monsters' souls worth a certain amount of soul energy, or tie the number into monster level (so levelled monsters yield higher energy). Along the way, the character may find/buy larger soul gems to store souls of more powerful monsters. The soul gems change to reflect a particular ego type depending on the soul trapped in the gem:
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The Cyclops's soul is trapped in the Average Soul Gem!
You have an Average Soul Gem (Cyclops).
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The Cyclops's soul is trapped in the Grand Soul Gem!
You have an Grand Soul Gem (Cyclops).
The character could then imbue a piece of equipment with the filled soul gem to grant it extra powers. The larger the gem, the more powers specific monsters' souls grant:
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You imbue the Average Soul Gem (Cyclops) with a Broad Sword (+0, +0).
You have a Broad Sword of Cyclops (+0, +0) (+2).
An Average gem may yield a Broad Sword that increases strength by 2.
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You imbue the Grand Soul Gem (Cyclops) with a Broad Sword (+0, +0).
You have a Broad Sword of Cyclops (+0, +0) (+2).
A Grand gem may increase strength by 2 and grant bonuses to searching and seeing invisible, etc.
You could place a restriction that uniques could only be trapped in the highest quality gem, but their soul would make a weapon sentient up to the unique's clvl or grant a piece of armor an immunity or two, or something along those lines. Some extra evil uniques may be especially powerful, but also have "accursed souls" that curse the weapon with AFC or Morgothian or something.
Expanding upon the concept, perhaps a player could set a Soul Gem in an empty amulet/ring and receive powers that way.
Granted, this is all very complex, and you'd have to carry a variety of soul gems to accomplish exactly what you want to, but it would make for a more strategic game than any other imaginable.
Sorry for the long post...guess that's actually more like my $35.02

"Consummate V's! I SAID CONSUMMATE! Sheesh! You wouldn't know majesty if it came up and bit you in the face!" - SB