[Gold]

The entire lightning tree is high damage with zero effects. Its damage is high and it moves fast. It does not need any changes when you consider the tree it's in. Unless you want to give lightning of all trees an unnecessary boost.

Nerfing piercing strike to buff arc sounds good to me.

I agree with the tree being high damage, the nerf to Javeline was needed and maybe now piercing should swap with arc since it is after all worth a master token.