For the new players if you see this thing in the water DONT APPROACH IT IF YOU GO NEAR IT IT WILL KILL YOU AND DONT BRING YOUR PETS NEAR THEM I LOST MY ARMY OF DILOS 2 CARBO 2 TRIKE 3 RAPTOR AND MY SACRO FROM THESE THING JUST DONT GO NEAR IT IT SWIM VERY FAST

I rather fight 5 gigas than these things, thats because they are stronger than 5 gigas! Whatever you do, dont step on the water, they are aggresive and can silently sneak up on you and stun lock you. First, look in the water to see if there are any, then if there is, Shoot all of them with a ranged weapon. Then you're done.

Ok, so I was once taking a swim while my tames were near the shore and when I look to my right, these guys showed up and I swam for my life but the shocked me so when I took my spear out and hit one of them my tamed came over and started to attack these jellyfish...

I lost my Scorpion, Parasaur, and Sacro. :(

R.I.P. Scorpio, Lilly, and Snapper...

These things will follow you to the end of the earth. For bio toxin harvesting, I like to build a pen in the water to lead them into then hit them with a longneck or shotty from the shore.

WORST THING IN THE GAME!!!!!! They will stun your tame and kill it, regardless of the level. Only the basilasaurus is safe. If they sneak up on you with your mosasuar, they will kill you and the mosasaur

Use the basilosaur, it’s not affected by the jellyfish it’s ability

Once I saw this thing in the water and I was like “ oOh I Didn’T KnOw TherE WeRe TreASure chEstS In tHIs gaMe “ and just ran like Usain bolt into them. I’d say it was more insane Bolt. And Bolted to the spot was I! Yep, my discovery of the Cnidaria!

In early game they are the must annoying water creature ever, to kill them you need to bring them to the nearest point from beach land then kill them with arrows and if melee weapon so be fair as possible to be save from these annoyers

Ark has a kill 250 dodo quest on mobile… why don’t they have one for these demons? One Like=one person who wants there to be a kill 1,000 Cnidaria quest. Also they killed my first turtle my sarco and almost my spino I have been gathering amber to revive my sarco.

To kill these guys, make them follow you to a shore and poke at them with a metal pike from where they can’t reach you.

Don't, just don't. These plastic bags are only slightly malevolent.

U can still hit them when u get stunned

These guys are the spawn of satan. Don’t go anywhere near them

I need to take an rex, looks like I'm out of shocking bullets...

Jelly bois: *chuckles* I'm in danger

Jelly bois after I get there, for no reason: *chuckles* YÕÜR ÏÑ DÅÑGËR

So, I tamed a mosasaur after that I encountered THESE monsters known as Cnidaria. Here’s a little tip if it throws you off your mount swim down and kill the jellyfish

These guys are why you don't get attached to your critters.

The only creature you’ve really got to hate. Admit it, you lost a Baryonyx or a Megalodon to this, “thing”…

To kill a Cnidaria, you first need to stay distant from it. Your materials needed are simple, a ranged weapon (Bow, crossbow, gun ECT. Plus lots of ammunition for the weapon. Next you will need to scan the water. Check for piranhas and other predators: IF THEY ARE NOT NEAR YOU CAN BEGIN. First enter the water. Next get close enough till the Cnidaria starts to come. They are slow and with enough speed you can get away. Slowly bring it towards the land/sand. It will try and follow you, since the sand is inclined it can’t come up. You may then start to shoot it in the head (to kill it faster). That is how to kill Cnidarias. If this helps PLEASE up this. Thank you!

Yes they are dangerous, but if you use a pike you can float near enough to dmg and or kill, they are usually fragile, but if not you can aggro to shallows and shoot with rifles etc...

I love these suckers on the island for the ease of access to biotoxins.

They are shocking and will stun lock and kill in groups one alone is manageable it stuns mount, you pike or arrow till it dies or visa versa.

Use your basilosaurus to get free biotoxin, they don't get close enough to kill u, ur friends, ur family