Well, unless you haven’t seen the Season 10 comics, here’s the context.
 
Danu is the leader of the Knights of Order (Formerly of Harmony), a leucrota from a hidden kingdom known as Cunambula, a kingdom destroyed by an internal war.  
Their ancestors distributed Tree seeds among various species, except the ponies, and taught them to use the Elements, but when there were conflicts, they took care of the bearers of the elements and hiding the temples of the trees, now after thousands of years the trees are activated and to prevent Equestria from falling as Cunambula, Danu and the Knights … they tried to destroy the carriers of the elements: (that is, the Ponies).
 
As you can imagine, Twilight and all her friends gave him the beating of her life; but Danu warned of a possible war to end Equestria.  
Could this be a harbinger of Generation 5?
 
Obviously this is his human counterpart, or perhaps it is the same one that found how to get to Earth and upon detecting the Geodes of the Rainbooms, he considered that they would also be destroyed for bringing magic to an unknown world… starting with Sunset Shimmer for having brought an Element to Earth in the first place.
 
Base by yaya54320bases