Hey Guys, I've been pleasantly surprised by lightning tendrils while leveling and I keep lightning tendrils in my shortlist as a league starter.
Maybe you could look at my PoBs! One is life based, the second one is a far tankier CI version which should be my lategame transition. The life version has 1.5Mil DPS while the CI version has 2M DPS, both on modest gear requirements.
The CI version has 120k max damage taken, the life version has a merely 12k.
https://pastebin.com/cyiXgWrT
https://pastebin.com/4nY9sKEc
Let me know what I can improve upon :) I know occultist is a strange choice at first, but the power charge stacking is very efficient early league to scale DPS, aswell as the dual curse option which allows for a lot of flex early game where you can tech in temp chains, enfeeble, etc... Explosion also helps with clearspeed since tendrils only hits a cone in front of you, the ES Regen ascendancy only shines once you transition to ES.