======Tough Quests======
"Tough" quests are those that require at least one key item to complete, and involve either a difficult boss location, a time-consuming check, or at least one terminal key item.

Since the Darkness Crystal and underground access unlock quite a few of these checks, the lunar and Feymarch boss location quests are weighted to balance their frequency rate against the other quests.

=====Tough quest pool=====
When objectives are generated with the ''Orandom:tough_quest'' flag, they are chosen from a pool of 14-22 quest objectives.

The following quests are always in the tough quest pool:
  * Burn Mist
  * Cure the Fever with the Sandruby
  * Complete Cave Magnes
  * Complete the Tower of Zot
  * Liberate Baron Castle
  * Defeat the Baron Basement Throne
  * Launch the Falcon
  * Trade Away the Rat Tail
  * Trade Away the Pink Tail
  * Return the Pan to Yang's Wife
  * Complete the Sealed Cave
  * Destroy the Super Cannon
  * Have Kokkol Forge the Legend with Adamant
  * Defeat the Giant of Bab-il

Each of these quest objectives has a 60% chance of being in the tough quest pool:
  * Defeat the King of the Feymarch
  * Defeat the Queen of the Feymarch
  * Complete Cave Bahamut
  * Complete the Murasame Altar
  * Complete the Crystal Sword Altar
  * Complete the White Spear Altar
  * Complete the Ribbon Room
  * Complete the Masamune Altar