I added a general damage calculator to the same tab, which accepts a variety of modifiers including HP, ATK, DEF, and DMG (reduction), and outputs the modified damage and--most importantly--how this affects the hits til death (HTD). This is a stat I came up with that's a bit more intuitive than effective HP, but serves the same purpose. For example, imagine a scenario where you could reduce incoming damage by 90%. 5% more damage reduction on top of that seems paltry, but it actually DOUBLES your survivability.