Caustic arrow build (need suggestions/critique/help)

Im planning to make a caustic arrow build on HC. I would appreciate it if people can help. This is my first time trying to make a build. I don't know what I did wrong or what is good/bad.

Below is a skill tree I made on a program called "path of building"

https://www.pathofexile.com/passive-skill-tree/AAAABAICAH11BnCi2cgUwJyNfbTRE9rEog2NFr959mKsZdPjhGyMgCJtbLIZJpWjiutjm7VxQ_66GYqDCWqMTZLuDmlOVUsmiHp_tUgj9sM6doL1b7vjES8FtRQJXkXPegguLiPo1p2qP2yHduhaZ6Dxs2HiIupS7MDjm41DNu2DtMUAXpcGU89vnktXsNiNvysKMgHUI2Sm034TbcLstzAOSBmOpzSCXud0ykoqWzY9XfJfsPrrsQGS88gMmCPjn-96Sn38xQ==

Last bumped on Aug 4, 2017, 1:45:28 AM
https://www.pathofexile.com/forum/view-thread/1291803

There's one of the many pre-existing CA builds. This one utilizes scion... there's another pure occultist CA witch build over in the witch forum.

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