Want to play Senna support. Which Senna build should I take ?

Senna 9.22 Build | LoL VVV
Senna Build for Patch 9.22 based on matches played by Pros. Counters, Skill and Item Buy Orders, Runes and much more provided.
Hey guys, usually I just check [Senna build](https://www.lolvvv.com/champion/Senna/build) of proplayer and copy them. But... Why do they build athenes ? More AD would be a lot better ? Can someone explain me the reason behind it ? GL at the rift Spirit Bomb {{sticker:slayer-jinx-catface}}
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