I was looking through the wikis for a solution to this, but was unable to find one. I wanted to have my AC automatically adjust for when I'm bloodied (thanks to my Dragonborn Grieves), but the #Is_Bloodied macro trick doesn't work with calculated values like those. Thankfully I was able to come up with a formula that can be inserted into any attribute field: (round((@{hp|max}-abs(@{hp}))/@{hp|max})* x ) where x is the amount you want to buff that stat. I'm using this to buff my AC and Reflex by 1 and my speed by 2 when bloodied. Our group may be moving towards using calculated values and targeted abilities to auto-determine successful hits, so I'm happy to have found this solution. Hopefully it will assist anyone else who likes to play Dragonborn or Revenants. :)