NPCs:
1. Old Quarrier (Ape City)
2. Norbert (forest village)

Level Requirement:
As long as you are able to kill the Bandit.

Reward:
Bomb

Walkthrough:

1. Find Norbert in the forest village to know the whole story, the reason he invents Bomb, the materials needed to make Bomb, etc.
2. Get five pieces of Saltpeter from Old Quarrier.
3. Kill the Bandit to get a Sulphur.
4. Give (five pieces of Saltpeter)+(a piece of Sulphur)+(30000 silvers) to Norbert, and he will make a Bomb for you.

How to Use the Bomb:

Put it in your inventory and then click on the guild gate. If the gate is closed and it is Guild War time, you will be asked to confirm whether to use it. The Bomb exerts enormous damage to the gate. Using 4 Bombs in maximum can open the gate. By the way, you will definitely die if you use it.