CRAY/PSCN doesn't delete DMND.
It is this way as a tool, not as a weapon. No bunker needs to be able to stop it. If yours for some reason does then you can use subframe SPRKed EMP to prevent it from functioning in most cases. Failing that, then you can embed pixels of DMND in your bunker in such a way that they stop CRAY rays but don't stop "conventional" weapons.
Neither CRAY nor FILT will be destroyed by the ray, however, they also won't stop it. DMND is the only thing which can stop it.
what about stacked cray ontop of the blocks? if it stops cray weapons then if u put it in the whole bunker then it wont do a thing?