Razorfin

A Razorfin is water based creature native to both Eternia and Etheria. It is capable of tearing holes in the hulls of the Sea Elves' ships.

He-Man once battled several Razorfish in the Crystal Sea which turned out to be mechanical duplicates.

She-Ra once came to the rescue of a sinking ship manned by Sea Elves.

Trivia

 * The design of the Eternian Razorfins was seen earlier as a snake in the He-Man and the Masters of the Universe episode Dawn of Dragoon and will be used again as the Sand Snake in Teela's Trial and the 'Snake of Snake Mountain', with a different color and a larger size in Golden Disk of Knowledge.
 * The Etherian Razorfins are never visible on screen.

He-Man and the Masters of the Universe

 * ''Search for the VHO

She-Ra: Princess of Power

 * The Sea Hawk (mentioned)