at core rules permanent death is possible (of course you can always reload if you're not into a no-reload game)
If you want Sarevok to change that badly you could open up Shadowkeeper and mess around with some global variables but IIRC the oath option has some dialogue lines following up you probably missed so it's gonna be tough.
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\"I am forever spellbound by the frailty of life\"<br /><br /> Faceman
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