Mash monsters

"Mash" monsters are phantom versions of certain Hexen monsters that cannot be placed as things, but appear via scripted events. They are identical to the normal version of the monster except for two things: they are translucent, and they vanish instantly when killed rather than having death animations. The term "mash" comes from the script spawn names.

In the original levels, mash monsters are produced only by scripts invoked by Korax in the second phase of battling him in the Dark Crucible. If Korax is slain quickly, they may never be seen in a playthrough.

Four monsters have mash versions:
 * Ettin
 * Centaur
 * Green chaos serpent
 * Brown chaos serpent