Guys, i finally got a hold of the plasma beam mentor and it's BEAUTIFUL.
I'm willing to bet Styg'll probably nerf it to the ground, but here's the highlights:
First of all, has no cooldown whatsoever. You can spam it as long as you want, if you have the AP (25) and psi (70) for it. Most important of all: it DOES crit. I have effective 185 metathermics in my current Crossbow/Metathermics build. I can crit for about 700 damage with a single cast. Great range. Gotta test it in groups of enemies though. It's powerful on my mixed psychosis build, i can only imagine the punch it'll pack on a 18 WILL build.
Now for the location of it, since those reddit fags who found it won't spill the beans:
You can get it two ways. The way i got it required finishing the oligarchy questlines. Once Tchortist get the cube, if you explore Upper Underrail on screen left of the Lunatic Mall you'll see a Lunatic Stairmaker blowing a hole on the ground with TK Punch. Kill him and go into the hole, it's a dungeon full of Lunatics and Psionic Proxies (doppelgangers like the ones in Tithonus Lab)
The mentor is loot from a Lunatic Overseer.
The other way to get it it's one of the Lemurian facilities but i don't know which one, since i didn't start expedition with this build yet.
Oh, and yes, if you enter the Institute via this dungeon, they'll be hostile and attack on sight.
