Tips on how to deal with the nightmare shades

[ArnoldRimmer]

They resist everything, even pistols and such that should be viel piercing. Aloth even fired off TofTV a few times and it did nothing. How the hell do you kill them? I tried crushing doom, storm of fire, meteor shower, nothing seems to affect  them, no weapons that I possess seem to harm them.

Edited July 7, 2019 by ArnoldRimmer
a change

[Wotcha]

Like many of the fights in the Seeker sequence, there is a trick.  All of the shades are invulnerable except for one.  Kill that one (and the sub-shades it spawns on death), then find the next unprotected one (when you kill the vulnerable one, the vulnerability jumps to one of the other ones), lather rinse repeat. 

Edited July 7, 2019 by Wotcha
clarifying vulnerability jumps