After talking to the lich queen I can reliably find Ahru in 2 different places. And one of them doesn't have dialog related to the lich's request.
The other has an oversimplified dialog in response.

So the lich asked me to kill ahru.
I used the rune to go back to Cyseal immediately to see what Ahru had to say/offer. His dialog wasn't updated to include this situation.
I saved and killed him and there were any sapphires on him and he hadn't said anything about them.
So I reloaded and skipped this choice.

Later I was going the skeleton merchant in hunter's edge and saw that the Ahru cat was still there.

The cat at least responded to include information about the lich and the sapphires.
That dialog was pretty disappointing though.
It covered the bare minimum of the possibilities only.
Either "oh no your killing me" or "go kill her by destroying her corpse" only. There should have been hints about temple and corpse. Or at least just more to it.