If an enemy is “undead + human” (Wendigos). Do my racial bonusses to both races add up? Additively? Or is only the higher one counted?
I remember testing it. Yeah, they should stack.
I was actually just about to ask this 
Try Revenant,Double Bone and Direwolf Crest against Reaper. Liked the result,wee 
and wendigo devo node and Primal Bond?
No,haven’t try all sources, but definitely are stacking.
and double of cruelty affixes 
there should be an easter egg creature that is classified as celestial, human, beast, undead, magical, eldritch, aether, and chthonic simultaneously. that way, it will be both the most legendary creature ever, and the most vulnerable creature ever.
I think zantai mentioned in an old forum thread I made that it’s additive. 20% aetherial + 20% human is 40% against alex
its ironic that gaining ascendancy makes you vulnerable to stacked racial damage.
It’s not the final level tho. Look at Lucius, or Theodin.