Today I’ve specced my Skeleton skill to have only warriors, and also make them cast Bone Armor on them and on allies due to picked Bone Share node. Surprisingly, while skellies indeed cast the buff on themselves they didn’t do that on me. What the…? Isn’t my character counted as ally somehow, even if the extended tooltip deliberately states so??
It is, unfortunately the Skellie version of Bone Armour only provides % damage reduction rather than also flat armour like the Transplant version so it’s not going to be easy to see if it’s just an animation/buff icon issue or not.
Sadly, single skeleton cast the armor neither on me nor on bone golem, it keep to cast it on itselves. I’ve checked if it cast on ice beetle from shrine - nope.
The % damage reduction would likely be multiplicative rather than additive, so you’d take 10% less damage (down to 90%) then another 10% less (down to 81%).