This cover shows the moment just before five Atlanteans died horrible deaths.
Aquaman is returning home from his adventures with The Batman and boy is he going to be pissed when he sees how Mera was treated while he was out. You know who else is pissed? Creature King!
Maybe not so much "pissed" as "overenthusiastically alive."
But there will probably be some conflict since the Karaquan is sharing the brain of Coombs whom Aquaman saved. So in the eyes of Creature King, Aquaman is both killer and savior. That conflict will probably be important to the story later.
Holy unruly Underrealm! And I'm talking about this guy's wayward pubes.
After defeating the leader of the Underrealm, Mera hauls him away to partake in Atlantis's version of waterboarding.
Meanwhile, Aquaman is being attacked by a bunch of creatures. It's almost as if they were listening to a new king! It's also almost as if they're tired of Aquaman always using them against their will to fight his battles! Although I think it's more the things about some other king, perhaps a "Creature King," now manipulating them to fight for him. Poor oft-abused sea creatures!
This is as close as this comic gets to calling the new antagonist "Creature King." He reveals himself as Chimera on the last page. I guess "Creature King" was too old school even for a Jeff Parker comic called "It Lives!"