I admit that I've only played the class to level 20, and I freely admit to making mistakes along the way.
It appears that the stat requirements for gear would mean that the ER needs 6 STR/1 Dex per 2 levels, maxing out DEX at 55.
This leaves 3 points to do with what you will.
There is a skill uses HP% directly for 10 seconds of Immunity (I'm on mobile, so please forgive me for not including the Skill name and detailed information).
This seems like a good argument for investing at least some points into VIT, but someone did point out that using Gems to stat gear for HP is probably more efficient. I mostly agree with that.
So that leaves STR as a good place to put those remain points.
Please feel free to respectfully contribute your thoughts and ideas on the topic.