This is my favorite event in the game. It has elements of a musou game in that you're essentially capturing enemy strongholds and planting your own flags on them. Doing so raises your morale and makes you stronger, conferring amazing buffs like actual infinite stamina (which I just got and makes traversal in this game so, so, so much better) as well as insane cooldown reductions.
Everything else in this mode is equally fast paced, such as the treasure chest tracking that you get once you beat the area's elite boss. The game tells you where the next chest is and automatically pings it on your map. Then, literally as soon as you open that chest, the game IMMEDIATELY tracks and pings the next chest in the area without you needing to do anything. Why can't the rest of the game be this fast paced?