Just posting this here for anyone else who runs into this problem in the future. I have several seemingly random NPCs where MonsterHitDice doesn't seem to work for some reason. I finally pinned it down to this: " The default token for the character needs to represent that creature but should not have the bar used for hit points linked to an attribute. " And I was thinking... I have the Bar1 link set to 'None', so why isn't this working? I was using TokenMod to set up all my tokens, including this: 'bar1_link|None', which unfortunately sets the linked bar correctly to not be linked to anything, but still sets some 'value' even though it's the same as what appears to be a 'null' link, so MonsterHitDice reads it as a 'linked bar', and doesn't work. But using'bar1_link| ' correctly sets a null value, and !mhd will work as expected.