Just had a fight with Vesalius and died a lot. I noticed that I couldn’t seem to get any Bone Armor stacks on him. Don’t think I’ve seen this issue brought up before. Using the Masquerade set.
If you only have 1 stack of bone armor, it won’t show a number in the skill bar. The only way to tell when you have 1 stack is if your character looks like they are wearing bone armor, but you will see the progress bar for when the duration ends.