Uhhh I can explain (description) 

ANYWAYS the ones in thumbnail are the new and improved monster masks so the middle one is Massacre and he represents anger.... the left one is Menace and he represents sadness and the right one is Slaughter(my grandpa) and he represents joy.
Slaughter is the one that made those masks and the love, moon, X, star masks but he didn't like them so much so he just left them in different areas and I guess that's how each of them found those masks They either cloned the masks because they didn't know how to make it the same.
I think y'all know Slaughter from in an old video-
That's all bye!