#but causing pain paralysis heart attack and seizures depending on the individual biology of the victim

[jackdaw-and-hattrick]

Some art for ya. (Sorry I only sorta listened to the color descriptions, I got carried away.)

Jason: Lionfish (specifically based on a red lionfish)

Danny: Amalgamation of a Betta fish, jellyfish, and a variety of deep sea creatures (while his “human” form is black, his ghost form is clear with a bioluminescent white glow)

Mermaid au where Danny gets thrown into another dimensions ocean and turned into a mer. Unbeknownst to him, the batfam meets a similar fate a month later and crash into the ocean. They have a much harder time adjusting to thier new bodies and have to make adjustments for the new watery environment. Meaning they had to ditch most of thier gear in a hidden location until they found a way to return to thier human forms (not that thier pants will ever be of use again lol)

They swim to the surface to talk and hopefully come up with a plan, which is difficult due to the new set of sharp teeth some of them had. It was obvious most of them were different types of mer. All of them had scales, fins and scaly arms from thier elbows to thier very sharp/ claws. Tim was all black with a dull and unnoticeable red tent to the tip of his claws and sharp edges to his fins. It didn't take a lot to prove he was poisonous.

Cass was very brightly colored to her surprise. Her tail was colored like a sunset and she looked the least threatening of the group and the most like a traditional mermaid.

Stephanie was overjoyed to be her favorite color! Her purple scales came in coordinated patches throughout her body, like a sort of armor. Her stomach, upper back, elbows and knuckles all had the thick hard scales decorating them. It was clear her species was made for combat.

Bruce and Damian looked largely the same with the difference being thier colors. They had claws like Tim, but no sharped fins or poison.

Dick looked the least like a mer out of all of them. His tail was long and thick, his fins were small but flexible which allowed him to be fast and limber in the water, doing loops and flips in a blur of blue and black. He was having an absolute ball.

Jason was the...shiniest of the group. His orange, red and gold scales glistened in any amount of light and attracted fish to them that would be immediately adopted by Damian. Jason quickly grew annoyed at all the fish coming to peck at his scales and started coating himself in mud...that would just fall off due to the smoothness of his scales. He was not having a great time.

Danny was lovely. He had long flowing fins like that of a beta fish sprouting all over his tail. His body looked like it was swathed in inky black silks at all times. This, combined with the scales on his arms ruching up to his mid biceps made him feel like a lady at one of those galas Sam hated so much. He felt pretty. His past experience flying through the sky with his ghostly tail was much appreciated now that he had to figure out this mess of scales and muscle.

His Phantom form was much the same, except he was entirely white and glowed like a star in the dark of the ocean, leaving him feeling (and looking) like a bride on thier wedding day. His friends could never find out about this or the teasing would never end.

Danny came into contact with this pod of mer a few days after they arrived. They were racing towards him while he was in his Phantom form, which wasn't unusual for fish, but mer? He had never made contact with any of the other mer unless one came up to him to flirt or try to kill him for being too close to thier territory.

Deciding to err on the side of caution, Danny kept turning invisible whenever he saw them coming his way. It wasn't too long before the batfam came up with a plan to sneak up on the other mer. They sent Tim, the most well defended and darkest colored of them to talk to him and maybe get some answers. Or at least directions.

Things went wrong almost immediately. Phantom flared his fins the moment Tim tapped his shoulder and caught him in the silky appendages. What no one realized was that his fins weren't made of cartilage or whatever, but were genuinely made of thin, strong muscle for capturing prey. Toxins filled Tim's body leaving his body to go slack in the others hold, and Danny was wounded by the razor edge of Tim's fins as Tim's own poison entered Dannys veins.

Everyone was panicking.