Covert Ops
From Roll20 Wiki
Macro for a D00 Die Roll
Covert Ops is utilizes the D00lite rule engine that uses rolls of 0-99 instead of the usual D100 results of 1-100. This means you need to create a simple macro to roll this properly:
/r 1d100 -1
You can make it a bit more useful by including a pop up asking for the modifier to apply to the roll. The result is then final.
/r (1d100) + ?{Mod|0} -1
The same as an Inline Roll.
/em rolls a [[1d100 + ?{Mod|0} -1]]
Creating A Custom Deck for Bones
In order to easily track Bones, you can create a custom card deck (decks and tables tab, "Add" button). Pick an image to use as the card background and upload it, and then create a card. Upload an image to use as the card front. Set "Cards in deck are infinite." Shuffle the deck once and your basic bones deck is complete.