ZDoom

Fixed.

	// [RH] Missiles moving perfectly vertical need some X/Y movement, or they
	// won't hurt anything. Don't do this if damage is 0! That way, you can
	// still have missiles that go straight up and down through actors without
	// damaging anything.
	if ((flags & MF_MISSILE) && (momx|momy) == 0 && damage == 0)
	{
		momx = 1;
	}

Here's the problem:

[code]
// [RH] Missiles moving perfectly vertical need some X/Y movement, or they
// won't hurt anything. Don't do this if damage is 0! That way, you can
// still have missiles that go straight up and down through actors without
// damaging anything.
if ((flags & MF_MISSILE) && (momx|momy) == 0 && damage == 0)
{
momx = 1;
}
[/code]

I think this should read 'damage!=0' instead as the comment above implies.

Hmm... I don't understand then. I tried it in .96 from two different save games and also using the lego cheat, and I couldn't kill anything with it, not even barrels. I then tried using the same save games with .96 and it worked there.

Confirmed. It seems perfectly useless against enemies.

Unless I'm not using it right, the first piece of the sigil doesn't hurt anything. It seems to work in .96 though.