No idea, but if it's not who you want, abandon the fight and you'll get your rune back. Rinse and repeat until you get the boss you're looking for.
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How do you abandon the fight?
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Get killed and then you spawn back up where you put your rune in. Don't go past the barrier and it will give you a count down timer to return to the fight. Don't return and you'll get your rune back.
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Oh cool i didnt know that. Thanks that helps a lot since i only have one antiquated rune.
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Anytime, and good luck.