Onyx achievement

I would like an Onyx achievement.

Something like killing all rare Onyx bosses.
The reward: a minor rune that increases some statistic out of combat.

And a title that shows your perseverance ^^…

Let me hear what you think :slight_smile:.

And this should not be too difficult to code into the achievement system with bit of perseverance from a developer…

That would be a hell of a grind. It would be cool if they added the ancient tablets back to unlock the portals for extra bosses.