Board Thread:Warhammer 40k General Discussion/@comment-86.7.138.66-20130615215334/@comment-37997830-20181231145059

i think it's more like if tau is the ones the old ones secret weapon, i mean the ethereal ones ,their idealism is almost same as the old ones ,their sudden appearance in warhammer world,their unusual technology advance and  for the tyranids i think it's just unfinished creature that created by old ones ,meanwhile old ones survivor already settled in new galaxy knew tyranids is their mistake to begin with they send ethereal to unite all young species to prepare wiped out tyranids, but unknown to the old ones the galaxy they left behind so mess up ,without prepared to that situation the ethereal take different approach , that's perhaps the reason the ethereal said the eldar should understand their cause.

But that just wild theory.