Pathfinder: add thundering to weapon

Hi, I'd like to add to my weapon this magic ability: Thundering Price +1 bonus; Aura faint necromancy ; CL 5th; Weight — DESCRIPTION A thundering weapon creates a cacophonous roar like thunder whenever it strikes a target with a successful critical hit . The sonic energy does not harm the wielder. A thundering weapon deals an extra 1d8 points of sonic damage on a successful critical hit . If the weapon’s critical multiplier is x3, add an extra 2d8 points of sonic damage instead, and if the multiplier is x4, add an extra 3d8 points of sonic damage. Subjects dealt critical hits by a thundering weapon must make a successful DC 14 Fortitude save or be deafened permanently. CONSTRUCTION REQUIREMENTS Craft Magic Arms and Armor ; Spells blindness/deafness ; Cost +1 bonus How can I put it in the Roll20 Pathfinder sheet? Thank you in advice.

Assuming you are using the Pathfinder by Roll20 character sheet, I'd suggest adding "Thundering: +[[?d8]] sonic damage if crit" to the Notes of the weapon. It's rare when a crit multiplier of the weapon changes so having this Note static will appear with each attack and you can ignore the extra damage if it isn't a crit.

It's not what I wanted but still works. I mean: Pathfinder is full of magic effects that activates in crit and skill to make you easier to have a crit, so I find very strange that you can't costumize this in the sheet. BTW with this method I don't have to write the roll everytime and also you're the only one who answered me and gave me a solution, so: Thanks.

Another option is to add a button to the notes section, [Thundering](~thunderingMacro) Then add thunderingMacro as an Ability macro on the character's Attributes & Abilities page. Something like: &{template:default} {{Thundering Weapon does an extra [[2d8]] damage. Target must succeed on a DC14 Fortitude Save or be deafened.}} You'd probably want to use a PF template to make it look nicer though.