Extra Critical Hit Multiplier

[asearcy]

Hi all,

I am trying to figure out how to write the code for adding an extra critical hit multiplier for every weapon you use while wearing a Ring. I am converting the 4th Edition D & D ring, the "War Ring", to Pathfinder in the Hero Lab editor.

"When you score a critical hit, deal 1 extra die of critical hit damage, based on the weapon or implement you wield."

I cannot find a similar rule to use as a guide. Any help would be appreciated.

Thanks,
Alex