Quests

Storyline quests
Storyline quests are the main quests in cabal. They have good rewards and are necessary to progress to different locations in Cabal.
 * Again, The Story of Humans (pretty thorough)

Normal quests
Normal quests are optional quests given by different NPCs. They usually involve killing monsters or acquiring items from drops. altar of karion

Helper T quests
Hidden Helper T quests are also optional quests. The reward always includes a hard-to-find item.

Level Up quests
Level Up quests are mandatory quests for characters to increase their Class Rank.

Dungeon quests
Dungeon quests are started once inside the more complicated scenarios, and are used to provide hints on what to do next.
 * Lake in Dusk
 * Ruina Station
 * Volcanic Citadel
 * Tower of the Dead (B1F)
 * Tower of the Dead (B2F)
 * Forgotten Temple (B1F)
 * Forgotten Temple (B2F)
 * Forbidden Island
 * Altar of Sienna (B1F)
 * Altar of Sienna (B2F)
 * Illusion Castle Underworld
 * Illusion Castle Radiant Hall
 * Maquinas Outpost

DX Quests

 * Panic Cave
 * Crazy Train
 * Frozen Clue
 * Lava Hellfire