I checked "Malacath ring" , it seems to me that it functions like any other "damage done" buff in the game in the sense that the bonus is Multiplicative with other "damage done" increase buff,s as far as I can tell.
However, "Malacath ring" is also equipped with The blood thirsty" trait and based on my testings, the interaction between the Malacath ring" buff and the "blood thirsty" trait buff , is additive other than Multiplicative. Which results with very big damage numbers.
Am I missing something? Is this how the "blood thirsty" trait behaves on live as well? Is this a bug or intended?