Example: D&D 4e has a calculation for initiative = 1d20 + dex mod + half level. I already have an ability (called Initiative) on each character sheet for a player to roll that makes that calculation for them. I would like to use the value from each players' Initiative ability in order to calculate and set turn order programmatically. I know I can search for that ability object on the character object. Can I execute or call the ability once I have the object?