For this game anything in the Player's Handbook, Sword Coast Adventurer's Guide, or Hoard of the Dragon Queen is fair game. Attributes should be rolled in this forum so that we can all congratulate you on your awesome luck or mock your newly created sickly character.
1. Using the GP die roller, roll 7x4d6, for each roll throw out the single lowest value. From the seven totals left, throw out the lowest total and assign the six values in anyway that you'd like.
2. If after step one your rolls are pretty miserable, feel free to use the standard array of 15, 14, 13, 12, 10, 8, and assign them anyway you'd like.
Together we should all determine why your character are traveling to Greenest.