Hey fellow Diablo player! When it comes to defeating bosses in the campaign, it’s all about knowing their mechanics. Make sure to stock up on potions and have a good mix of offensive and defensive skills. For optimizing gear, focus on items that boost your primary stats and complement your build. Don’t forget to socket your gear with appropriate gems for extra bonuses.

When leveling efficiently, prioritize completing quests that give the most experience points. Stick to areas with monsters close to your level for faster leveling. And always be on the lookout for rare monsters and events for extra XP and loot. Good luck on your campaign journey!