The damage shown by a critical hit int he chat box, using the roll20 macros automatically built into the character sheet, do not double any damage that is added by the "other" section of the spells. For example, I have a 5th level Kineticist that can use the feature 'Elemental Blast'. It scales by +1d8 damage every 4 levels after 1st level. I have created a custom cantrip to be able cast 'Elemental Blast' using 2 actions. In order to have 'Elemental Blast' scale by +1d8 automatically, I have and this macro in the "other" section of the damage; ((@{current_level} -1) /4)d8 When I set the level of the 'Elemental Blast' to 5th level, it shows this extra damage in the attack roll correctly, dealing 2d8+4. However, the critical damage NEVER went above 32 damage. That means it was doubling the first 1d8 (16), and the +4 for CON mod (8), but only added the second 1d8 (8) once. (16+8+8= 32) As such, the 'Elemental Blast' was NOT correctly doubling the extra damage I had put into the 'other' category. PS It is possible that I got ridiculously unlucky with my rolls, but I don't think that's likely.