I think Ghostborn.I have jizoh, but he didn't seen worth it (spending skill tomb's) so I picked my best rare. I make a level 60 1 a month, so I'm getting close to my third, and in the next choices, I need to choose a spirit
What was you're first level 60 spirit character?
I'm a newish player myself, about 2 1/2 months in, but FWIW I decided to focus on 6 starring the heroes that would best contribute to progression rather than completing the relevant challenge. That means that 2 of my first 3 to 6 stars were magic, and my fourth will be magic as well. No need to rush completing the challenge if you don't have a worthy hero. I'm not even sure that my 5th hero to 6 stars will be a spirit hero. Currently my only significant spirit contributor is High Khatun, and, while she is on both my CB and arena teams, I get the sense that she won't benefit from / doesn't need that 6th star as much as some of my other heroes.
while i have lv60 maxed vrask I am no longer using him outside of FW - carried me to dragon 20 and IG 20 before I have replaced him to go faster)
He is a beast in FW though (lv50 carried me through rare skillbook boss back on initial iteration - before 2 nerfs that happened recently ...) - it was 15 to 20 minute fight on auto (provoked for most of the time anyway ...) but 2x immortal + HP sets with 100% crit chance makes him really tough target: between 4 and 5k regen from immortal (forgot now) + about 7k aoe heal on crit ... on lv 60 right now
if you have Occult Brawler - this one is nice to max for poisons on CB.
I have BEK and OB in my NM CB team and poisons get applied really fast, sometimes i need to pass on BEK skill to have room to apply defdown or atkdown ...