Hiya,
One thing ive noticed more and more lately is that the Necklace of Immunity which you buy from shopmenu no longer grants immunity for a fair few races out there.
It does still work for some... It seems to have recently stopped working for the Crypt Lords ultimate Locast swarm.
There are also the races which can teleport you to their position and switch places with you (cant think of names off hand) which the necklace doesnt work for.
This has been brought up several times ingame recently.... so thought I would mention it here.
Cheers
Scathe