Edit: The issue is fixed So I just spend about an hour trying to fix the "MonsterHitDice" script, which was nog working for me. I finally found the solution in this forum , but I wanted to make it easier for people to find the soluion. The Hit dice formula for monsters is "npc_hpformula", you'd want to use it. But it wasn't really clear to me that I had so select "custom" in the sheet selector. I am using the OGL sheet, so I have to select that one, right???? (spoiler: no) Thing is, the attribute name changed in the OGL sheet, and thus the script doesn't work. ONLY if you select custom, the settings beneath the sheet dropdown are used. So. It worked with settings: Bar: bar 1 Sheet: Custom - (use settings below) HitDice Attribute: npc_hpformula SRD Embedded Formula: enabled Separate Constitution Modifier: disabled Constitution Attribute: empty Constitution is Stat: disabled I hope this helps! Edit: The issue is fixed