Spoilers:
Some backstory, our friends scientists discovered that Karaku was the reason why Atlanteans abandonded this island in the first place.
Remember Karaqan from the opening arc? He was raised specifically for beating the crap out of Karaku, which he did, but now Karaku is strong enough to start a new fight and Karaqan is kinda dead so who is going to stop it?
Big brawl is happening and Daniel dies Aquaman rushes to his aid and gets punched by Karaku.
Mera builds a huge water construct, basically Karaqan made out of water. She punches out Karaku, but isn't able to keep the construct for long.
Since Karaku is out... Atlanna wants to kill Arthur and Mera, as she originally intended.
She doesn't believe that Arthur is her son, to prove it he summons entire sea life located near them saying that only son of Atlanna could do that.
That seams convincing enough for Atlanna. Aquaman explains thats its enough for him to know that she is alive and he or Atlantis won't bother her anymore. She teleports them out of the Pacifica.
Atlaanna also drops him a signet and a shell of sounds... like the one Mera was given by her mother in Secret Origins issue.
Anyway signet contains her essence and Atlantis should now recognize Arthur as the top dog that he is. She also asks Arthur not to inform Orm that she is still alive. She wants to tell that herself, once she is ready.
Strong arc, strong finish. Liked some extra details that connected whole run and made it whole. I also liked how Aquaman got most of the emotional stuff in this issue while Mera got the "powerhouse" moments.
Now, cautiosly awaiting previews of Bunn's work