Here is an overview of GulusNight and additional explanations, ask all your questions here:

> Night is about 1.75 times bigger and almost 2.5 times more powerful with this fusion
> Since first arriving from his "Dark" form, there is a simple way to tell if Night is in danger of "Dark Digivolve", Night's eyes are starting to turn pink
> Night is extremely violent in Gulus, being the extreme opposite of his initial form, in this form all his forever locked up rage is released and unleashed until exhausted or no longer needed.
> When Night returns to his original form, he is extremely vulnerable to anything.
>Night's "emeralds" are connected to parts of her body, allowing her to generate more flames and much hotter intensity
> Night's eyes change from green to pink showing his change from neutral to dark
> Night's bandana gains part of the Gulus aspect like his tail
> Night's character is a mixture of very strong aggressiveness and perfectly complementary calm.

Night belongs to me
Digimon belongs to Toei