Whys is ZXmasTree invulnerable to all but fire?

[Enjay]

I probably should know this but...

What is is about the ZXmasTree actor [wiki]Classes:ZXmasTree[/wiki] that makes it invulnerable to "normal" damage?

I can shoot at it with just about anything*, but it only gets destroyed when using a weapon that does fire damage. Is it simply because it only has a burn death sequence and no others?

*the exception seems to be hitting it with MDK which just makes it vanish.

[Graf Zahl]

Yes, it is the absence of a normal death state.

[Enjay]

Suspicious confirmed. Thanks.

I take that MDK destroying it (i.e. making it vanish) is something to do with MDK having massive overkill capabilities and the tree just going to a death state that it doesn't have? I note that the "massacre" cheat doesn't make that happen (I assume because the tree doesn't have the ISMONSTER flag).

[Graf Zahl]

All correct. MDK has special code to force a death and 'massacre' only kills monsters.

[Enjay]

Perfect, thanks.