Why do people do this?

I understand that it helps with her waveclear but her mana costs aren't even that terrible, even with a W max.

Wouldn't DFG be a better rush item?

More importantly, should I ever get Athene's? It seems useless on LB for anything besides the CDR.

Please help.

I didn't find the right solution from the Internet.

http://forums.na.leagueoflegends.com/bo … ?t=4923214

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