I’d say I’m having pretty bad day. So, I just bought Abberation and I was so excited, so I went over to the water. I don’t know much about Abberation, so I thought the Karkinos was just a kind little crab. Oh boy was I wrong.. I went closer to the water, as I was thirsty. But the Karkinos comes running up to me, picks me up and shreds me to pieces. Let’s just say I took a little break from Abberation 1 minute after I bought it.

Available at floating island caves in Crystal Isles.
They're very rare in there so be patient

It's a Giant crab that can throw it's enemies far away

They spawn in Genesis in several caves in the Lunar biome

Make sure to carry around grappling hooks
If picked you can graple the crab and it will let go

In the Crystal Isles, there's a large floating island with a massive river. There's at least six of them throughout that river. Get a couple high level aquatic or amphibious tames, I use a max level baryonix and Deinosuchus (modded), but a sarco might work. Don't just bring one creature, these things have no issues teaming up on their prey. Anyway, EXCELLENT resource for chitin and organic polymer, best I've found yet! Beware, though, you're not safe just because you're hovering over the water on a flyer, those things can JUMP!

Don't follow into the water, don't use tranqs and don't hit its legs with a catapult

In the wild crabs and spinos are buddies... they use the buddy system...

They can walk over spiked walls.

Will rip you off tame I repeat TAKE YOU PFF YOUR TAME AND KILL YOU EASY