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Never experienced D&D? Okay here's a quick rundown: You venture down a dark hallway after descending down the stairs, made out of cobblestone floor and stonewalls, properly cut, like men or dwarves made it, sophisticated-like, you can make out the details and runic inscriptions on the walls with your candlelight of the murals on the wall as you pass through the hallway, depicting various monsters fighting mythological heroes you might recognize from local tales you grew up with. As you creep down the hallway making sure that you don't trigger any traps, you start to hear a sound of goblins arguing loudly enough to being heard behind the door with someone speaking clearly the Imperial tongue, although poorly.
"But that's my pay!" The goblin says. "Hand it over you rat, I killed those men for that trinket!"
What do you do??? Do you enter the room and try to negotiate? Roll 2d6+Charisma Modifier, do you choose to wait for a better moment to ambush them when their argument is getting too uncomfortable to continue and you start to hear their steps away from the room? ROLL INITIATIVE! 1d20+Dex modifier for initiative each side.
basically D&D at least old school boils down to stuff like that, go look at Scarlet Heroes for a free solo RP rules. It might look complicated at first but its super simple grade school levels of math required and online dice can be used and it won't affect gameplay much mechanics wise.