Take Ahamkara off the list. They were hunted nearly to extinction and gave Guardians great power. It's be nice to fight one and get like 5 minutes of a buff, but the occurrence of this event (due to them being nearly extinct) would have to be so incredibly low that it wouldn't even matter. Probably like once every week, if even that.
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"nearly" ;) But yeah. It would have to make sense in the existing lore of the game.