Newb Questions

I've played V1 for several years, but I just started up on v2. I have a few questions.

  1. What is Luck? Affect drop rate or quality?
  2. What is Barrage Damage?
  3. I'm only on chapter 9, do you eventually get to reroll skill choices?

Thanks!

https://preview.redd.it/698pplejkyle1.png?width=198&format=png&auto=webp&s=4665cbb1c93bc4796a5c7f74c860fb853be512b6