Wowza! It's the hagfish! These slimy, sticky, yucky, nasty, evil-smelling jawless fish live commonly in the abyss, but can also be found in open oceans. Their favorite food is decaying matter, thusly why they are found around whale falls. If you were to give them rotten flesh, they'd probably lick their lips and say "yum yum!", if they had lips. Instead, they'll munch it down, and then produce slime. They also produce slime in the form of blocks when threatened, but these blocks dissolve in water after just a bit. Hagfish slime can be made into non-dissolving versions of hagfish slime blocks, which can be sunken into like powdered snow, but you will suffocate like it's water. even when waterlogged, they will even cause fish to suffocate. Hagfish slime functions like honey and slime, but doesn't stick to pistons. Instead, it is able to attach to the top of mob heads and slide them along with only minimal force. If you name a hagfish "Haagden", "Nether", "Wild Nether", "Wild", "Tulip", "Texas", or "Dutch", it will turn it purple as a reference to Haagden from the wild nether.