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To be honest I'll find any excuse to use fiery soul trap. But in this context the sword would first burn the victim(cleansing through fire). And...
I'd personally go with fiery soultrap and one of the absorb enchants. Fear, turn undead, and paralyze could work too.
The glowy light is kinda badass.
I love me some Hammer of Might.
If it had a better enchantment I'd use it a lot more.