What is the hardest quest in adventure to beat?

There is no single "hardest" quest in Adventure mode, as the difficulty of each quest can vary depending on the player's skill level, the gear they have, and the composition of their party. Some quests that are often considered to be challenging include:

- The Battle of Maldraxxus: This quest requires players to defeat a powerful lich and his minions in a difficult combat encounter.

- The Halls of Valor: This quest involves navigating through a series of challenging dungeons, each with its own unique boss encounter.

- The Crucible: This quest requires players to complete a series of difficult trials in order to obtain powerful rewards.

Ultimately, the hardest quest in Adventure mode is the one that presents the most difficulty for the individual player.