It works like a grenade and it grows on you (I think to you backpack).
Yes, you carry this somewhere on you ( I think it might even work in the agent's hands, but backpack is indeed the usual place; I myself have added a dedicated vest slot for it).
Although I'm not sure it really
grows on you, in any sense.
I've never bothered with Carapace plate myself, but the spidersilk vests are pretty nice earlier on. Maybe you can make a grenade magnet by adding carapace to something like the heavy tac suits, IDK.
I managed to get promotion 3 with cyberweb portal being taken, the cyberweb "bases" are not so bad!
Yeah, I was thinking of the extradimensional missions when I wrote 'too hard'. My bad.
BTW, does psi defense (on armor) where it does the calculations for psi skill*stuff*stuff, ... does this reduce damage by psi damage such as from ghosts? Or does it only defend against psi attacks like panicking and mind control ?
Yep, as psavola said.
To expand, 'Psi defence' is not really a stat, it's a replacement
formula for vanilla's PST + PSK/5.
It doesn't work on psi damage, since the latter is basically just the name of a damage type. Some enemies might have both better psi defence and high psi resistance, but this is done manually.