It should be noted that getting the Seekest Soul Power trophy will lock you out of getting the Maiden's soul, which is needed for spells and such. So, save to the cloud before the end, kill her to get the trophy, then reload and complete the final boss again without killing her in order to get her soul.
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Re: Demon's Souls: All Trophies and How to Unlock the Platinum
It should be noted that getting the Seekest Soul Power trophy will lock you out of getting the Maiden's soul, which is needed for spells and such. So, save to the cloud before the end, kill her to get the trophy, then reload and complete the final boss again without killing her in order to get her soul.