Battle Master Trip Attack Effect?

When you create a character with the Battlemaster subclass FGVTT will set up a power group for you in the actions tab. You should edit this power group to change the Group ability to dex if you are using dex weapons otherwise it defaults to strength. You should add in the number of uses into the uses box and leave everything else as it is. See video seven here for more information on Power Groups https://www.fantasygrounds.com/forum...sy-Grounds-VTT

Once you have made these changes click the green + icon to add a new line to the group and type Trip Attack into the left hand box. Right click on this line and select Add Action and then add Cast and set up the saving throw. Since you set the power group to STR (or DEX) then the correct DC will be worked out so all you need to do is change the Type to Str under the Save section. THis part is now complete. You can then right click again and this time select create effect and set up the Prone effect. Then right click for a third time and then add effect again and add the damage line (DMG: 1d8) setting the target to Self and the expend to On next roll. You apply this effect to the character before rolling damage and the d8 will automatically roll and add in the result to whatever weapon damage you do.

You should end up with this:

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