Naveldal

Naveldal is a new Shadow Wyvern that first appears in Monster Hunter Frontier Ultimate. It has access to the new Nightmare element, along with Nockturnus. This monster's main way of attacking is to turn invisible in a way similar to Lucent Nargacuga and attack the hunter from behind.

Description
"An unknown wyvern that can make itself invisible to stalk it's prey. One of the few known wyverns that cannot fly, but jumps instead. Just a terrifying."

Naveldal has the basic appearance of a wyvern similar to Rathian or it's Unknown subspecies, with a black colouring with slight red tints on the wing spikes. Most of the time though, you won't be seeing it at all, as this wyvern has the ability to meld into it's surrondings in a way similar to Chameleos and Lucent Nargacuga. Naveldal can also attack you whilst it's invisible, making it even more deadly.