Hey fellow Nephalem! When facing bosses in Diablo III, make sure to study their mechanics and adapt your build accordingly. Utilize crowd control skills to manage adds and focus on maximizing your damage output. As for gear optimization, prioritize critical hit chance, critical hit damage, and elemental damage bonuses. Don’t forget to socket your gear with the appropriate gems for extra power. For efficient leveling, run Rifts and Greater Rifts at a difficulty where you can clear them quickly. Also, consider power-leveling with a higher-level friend to speed up the process. Happy hunting in Sanctuary!