Night Crawler

Overview
A rare creature you'll only get to see if you recruit Avy. She brings one named Familiar with her, which has a couple of unique skills not found on other Night Crawlers. One of them is needed in order to achieve its evolution to a Portal Ripper, which means you will no longer have a Night Crawler, but it will give you access to her homeworld where you can tame wild Night Crawlers.

Combat
Regular Night Crawlers aren't really worth the effort, as they have average stats and a small pool of potential skills.

Moneymaking
They can be sold for 100 gold at Medium size and for 300 gold at Enormous size. Every level above 1 additionally increases their price by 5%.