It is just a dummy. It does nothing, just for a placeholder.

I felt its necessity while building my subframe stuff:

I'm using CONVs and CRAYs to modify other pixels around;

It needed some dummy elements to do nothing and not interfere with other pixels;

I used some elements in the solid tab: ROCK, CRMC, QRTZ, SPNG, BRCK, COAL, etc...

But some COALs started burning at some time, and SPNGs began sweating.

Here are some specifics:

Its ID could be 255...

And the name would be "DUMY".

It acts just like DMND by default.

tmp is used for settings (binary flags). The flags are as follows:

0x01: do not spread heat

0x02: blocks pressure

0x04: blocks energy particles (like GRVT, PROT, etc..?)

0x08: disappears when life decrements from 1

0x10: can be affected by CONV

0x20: can be affected by CRAY

0x40: LDTCs can copy its ctype

0x80: DTECs can copy its ctype