A: Hell Mode is a special mode in dungeons that allows players to fight extremely tough enemies for a chance to obtain better rewards. Epic items are also dropped from this mode.
There are 2 ways to enter Hell mode:
The 1st way is to encounter Hell Mode randomly. The chances of encountering Hell Mode increases with more party members. The more dungeons you run with the same party, the higher the chances of encountering Hell Mode.
The 2nd way is to force Hell Mode. This is done through quests given by Grandis which upon completion allows you to force Hell Mode to open in certain dungeons.