Hidden Helper T Quests are quests available in "Normal Quest" tree on the "Quest List" panel. There is a total of 81 Quests available, numbered 001 to 049 and 051 to 082.

When the Quests become available, you will be able to get them from "Grave's Holy Cross", which is located in Desert Scream, Southernmost part at the cemenary-like area occupied by Mummies (Desert Scream, XY: 32,38).

There are certain requirements for each of the quests to be met before aquiring them. Each quest has certain character level requirement and character class rank requirement (achieved upon completion of growth level quest). Without the class rank met - the quest will not appear on the available quest list in game. As an example - the first quest requires character level 36 and character class 3, so a level 45 character, with character class rank 2 will have no access to it.

There are 12 quests, which, in addition require an item to present in inventory. Those are "Dungeon Training" quests, which require a D.T. Card corresponding to the quest in inventory, for the quest to appear. If you have a card in your inventory, for which you have not yet completed Hidden Helper T Quest, re-log with the DT Card in inventory or move to warp zone or another town and the quest should appear.

-- from moomooo's guide

A story-telling type quest that is based on Cabal Online's game scenario.

• Field Quest:
  Field quests are similar to hidden quests, but they are specifically for undergoing Dungeon Quests.
  The Field Quest is similar to the simple quests but lead up to the Dungeon Quest.
  
• Dungeon Quest:
  Dungeon Quests are often related to field quests, and sometimes they are necessary to undergo Rank-Up tests as well. They are more difficult to undergo than field quests. .

Mandatory quests for characters to increase their class level.
You must satisfy the growth goal first in order to undergo a Rank-Up quest.

The Rewards