You need to complete the following tasks to advance to H grade (in this exact order):
- Win 3 Special Items in the (I grade) Arena
- Gather enough XP for at least level 16, according to the number of Rebirths (Levels)
- Kill the Dominator of the Astral System
Notes:
- Only the Arena winner receives the H grade special item award and only if he did at least 7000 damage
- A player can be the winner of more than one Arena in one day
- The Dominator of the Astral System is guarding the Hydrogen resources
- The Dominator of the Astral System can be killed only after the 3 special items are won