rigth in the spell file
for simpel spells. if 2 spells have "buff hp" in 1st slot, then which ever higher level will override the lower one.
if 1 spell has "buff hp" in 1st slot and 2nd spell has "buff hp" in 2nd slot- they will stack.
there are also special rules when you only want spell stack under special conditions. use Bleh/Aala spell editor and pull up info of spells like Blessing of the 9 , Virtue, and symbol of kazad. and see how each of them is writen out.
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