Vrathean

Vratheans were a type of huge, tentacled, deep-sea leviathan with a bioluminescent carapace that lived in the oceans of the planet Pabu, rarely surfacing from the depths. During or after 18 BBY, a vrathean attacked the Force-sensitive Asajj Ventress and the clone Omega while the pair were on a Pabu skiff testing Omega's m-count.

The creature capsized the skiff and grabbed Omega, who was rescued when Ventress cut off the vrathean's tentacle with her lightsaber. Omega's allies then opened fire on the creature from their attack shuttle Marauder, but Ventress had them stop and then calmed the vrathean with the Force, causing it to leave.

Text and facts from the “Vrathean” article on Wookieepedia, licensed under CC BY-SA 3.0. Modified for this site.