Build idea: Herald of Purity (phys to lightning) and Absolution -> Roast it plz

Cannot find any builds that are using both skills and I haven´t played any of those yet. So the idea is running Herald of Purity and Absolution with Summon Phantasm Support in Body Armor and a Two-Hand Weapon, each on a six link, or maybe one of the skills in a bone helmet/influenced helmet. Absolution can be 100 % converted to lightning. Sentinals of Purity at least to 50 %. Using a Two-Handed Staff can give u lots of levels on both skills for good damage.

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Questions:

- How can you convert more of the Sentinels´ damage to lighning?

- What influences could be good for late game links for each skill?

- What do you think about this in general? Can there be done anything usefull with this?

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Edit: This is how far I got: https://pobb.in/2lE1H8QpL_tY

Playtested with a lvl 89 Scion in T14 to 16 maps. It works pretty good in maps but struggles against bosses. Defences are rather poor. A lot of Unique Items are mandatory which leaves little space for mana and ressist mods. Therefore Purity of Elements is a must. I am also using Determination for phys mitigation. There is no more room for a damage aura, since HoP reserves quite a lot of mana. Currently my Mana is just enough to cast Absolution once and wait for mana to refill. Sentintels of Purity can be maintained with storm brand linked to hextouch and culling strike, wich fits quite nicely into the build.

Also I am not sure if there are better support gems, since I am uncertain about pob numbers. Can anyone help me out on this?

This might work out as a league starter but requires two good rolls on Mana reservation for HoP and could become rather expensive at league start.