I tried the demon Slayer set and the Blade Spirit support feels weird! Phanstasmal Blade is mostly a skill you use at range so by the time all the blade spirits start attacking eveything is dead from Phantasmal blade (or almost but even then their damage isn’t great).
Blade spirit seems to work best with melee builds (just to proc stuff because they don’t do enough efficient damage even when maxed). All in all it’s still a one pointer skill imo!
I’ve never actually used them aside of proccing stuff on my trickster, I even maxed it before Korba set was good and I saw no difference between 1 and 16 points spent. Nothing changed ever since, they only became permanent and got some skill modifiers. Ranged builds would only use them vs. bosses, if they just sit in one spot and spam their skills, otherwise there’s no reason to max them at all. I’ve made a thread about them about a year ago, maybe more than a year, and it’s still as shit as it was.
On paper, they seem to have nice damage values, but in practice it’s a joke, not damage. Blade Spirit need a serious buff, a melee-oriented set with huge support for them, otherwise just 1 point for melee and cya.