[AndMetal]

This came up on the Storm Haven forums, so I figured I'd mention what I have come up with so far, since this is still an issue.

After doing some digging (thanks to #mlog SPELLS__STACKING on), it appears this is failing in the function Mob::CheckStackConflict:

 1992 		if(sp2_value < sp1_value) {
 1993 			mlog(SPELLS__STACKING, "Spell %s (value %d) is not as good as %s (value %d). Rejecting %s.",
 1994 				sp2.name, sp2_value, sp1.name, sp1_value, sp2.name);
 1995 			return -1;	// can't stack
 1996 		}

And I believe it is because there should be a check, not only for the first spell, but also the 2nd spell to see if the slot is blank. If that's the case, we can just change this

 1913 		if(IsBlankSpellEffect(spellid1, i))
 1914 			continue;

to this:

		if(IsBlankSpellEffect(spellid1, i) || IsBlankSpellEffect(spellid2, i))
			continue;

I'll try compiling this here in a few and see if it works.