Does Sylvanas' "Possession" work on boss?

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Sylvanas' "Possession" on level 10:
Force an enemy Minion to fight for you. It gains 30% Attack Damage and Health. Cooldown increased to 20 seconds when used on Catapults.
... and on level 20 "Dark Lady's Call":
Increases the Attack Damage and Health bonus to 30% and allows Possession of enemy Mercenaries with a 20 second cooldown.
... seems not that useful unless it works on boss. Does it?
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Why Sylvanas' Character Arc Sucks
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