.getParty() method or - inMythicDungeonsParty{} custom condition
Moving this from the discord, I had requested a custom condition for MythicMobs that checks if the target is a player (or a mob's parent player) in the caster player (or a mob's parent player)'s party to prevent friendly fire. Alternatively, a .getParty() method in the party class to allow API users to get a list of all party members in a given player's party. The method can be used to make the condition, which is what I wanted it for, but it'd also be useful for a slue of other things.