Trying Kinetic Fusillade and would appreciate help understanding supports.

I was looking at Palestron's build guide for the KF Heirophant and noticed that Elemental Damage with Attacks is a support gem.

The gem doesn't look like it does elemental damage, or am I completely missing/misreading something.

I would appreciate it if anyone can help gain a better understanding of this.

https://www.poewiki.net/wiki/Tempest_Blast
https://www.poewiki.net/wiki/Storm%27s_Hand
https://www.poewiki.net/wiki/Grace_of_the_Goddess

Wand skills and passives generate a lot of elemental damage and its, generally, the primary way to scale wand builds. I don't know that I've seen a pure phys wand build after the 2.0 patch

Personally I prefer power siphon over the the other wand skills, the vanilla version if we're scaling crit and the "of the archmage" version if we're scaling mana.