Did you notice if the Ice property attack of the Seimos Xbow and fire property attack of the arde dagger stack up?
I know that it should bec. of the 2 different elem property attackā¦
Need Enlightenment on this one 
when u say stack up, do u mean a additional hit count appearing? or just a increase in ur dmg
I think itās just an increase in dmg of every number.
The buffs/items that add more hit to ur normal attack afaik is Cafrisun, Sacrament, Enchant Fire. (4 number in total if u play Pyro and constantly buy buff from town)