as we all know they are imba in most MU and in quite alot of maps .. and since i started playing random i get alot of eldar as my race so for guys who need help with eldar mirrors i have a simple but effective BO
HQ= Bonesinger,guard,guard,guard,FoF
first guard goes to harras the furthest point
then from your portal get ranger and there invis thing XD
send to harras even if its one point its good to stop them while you cap the map and your eco blossoms.
then obviously build gen,SS etc to get WS, tanks and FD
if this is done correctly with the right micro then your oppenant should fall way behind in tech