I agree with DWildstar, unfortunately Endless Night, at least a top tier one, is a card file that can only be created by the excessively wealthy. Having 3 Eskatia is essential to make a top tier Endless Night, and as a 5 star even if you bought 8 boxes on average you'd only pull a single Eskatia.
That said, you CAN make a still fun and respectable endless night deck without Eskatia, and most of the cards for such a watered down weaker endless night deck appear in set 2 and appear as 1 or 2 stars so its not unfeasible that you could get enough to make some sort of endless night deck from a single box.
Unfortunately because of the games lack of single card sales as well as lack of trading, you really shouldn't get your hopes set on any given strategy. Its really annoying, but the reality is that because of how cards are given out only a trandom, you can't expect to be able to make anything, you can only do your best to make something good out of what you have.
For example when set 2 was announced I had a deck planned that only hinged on my getting sets of a handful of 1 and 2 star units from set 2, and a single copy of a 3 star grimoire. I bought about 4 boxes of set 2 with the intent of making that deck... and yet I still can't. One of the key 2 star rare cards I needed 3 of I only managed to pull 1 of, another 2 star I managed to pull only 2 of, and as for that 3 star I wanted, I pulled 0 of them. It sucked, but all I could do was figure out a completely different card file to make based on what I did pull.
So yeah, if you want to try endless night I think luck favors you better with a box of set 2, but I think you really should look at both sets as a whole and determine which set overall has more cards you want at all levels of rarity so that even if you don't get what your hoping for, what you do get is still something you don't mind having.
The bunnies of Lavato have special abilities, like 'Action Skill: Make Carrot Disappear.'