Ah I see, 'Defender' the item type, not the class... my bad :) I expected the following to work: Putting [[?{AC Boost|0,3|1,2|2,1|3,0}]] In the attack/damage modifier or just the magic bonus on the item itself and AC boosted by [[ 3 - ?{AC Boost|0,3|1,2|2,1|3,0}]] until the start of the next turn. In the attack description to give a non-API visual representation of the boost (the API would require that the creator of the game has a Pro subscription). However, it doesn't work... the sheet simply doesn't see queries in those areas for some bizarre reason lol... the description bit works at least :/ I then thought of putting the main query as a bespoke attribute and calling that as part of the attack/damage bonus to see if it would resolve it that way, no dice... literally... it just ignored it, stupid sheet! Finally, I'd suggest something nice and simple that requires a little bit of manual mathematics, put this into the attack description: Attack/Damage boosted by [[ ?{AC Boost|0,3|1,2|2,1|3,0} ]] and AC boosted by [[ 3 - ?{AC Boost|0,3|1,2|2,1|3,0} ]] until the start of the next turn.