Chaos Volume V Enchantment doesn't seem to work. It says it gives a 10% chance for maul. I put it in 10 slots of my hero's equipment, but he didn't get the maul ability when attacking.
I also put Chaos Volume I + VIII and Wrath Master Volume VIII on one of my units. They should cast spells when the unit dies, but that didn't happen. I only saw a text appear over the unit, but no spell was cast.