On our server, you can obtain several unique Jewels:
- Jewel of Skill: Allows adding a skill to a weapon that can have one.
- Jewel of Luck: Allows adding the Luck option to any one item.
- Jewel of Excellent: Allows adding one or two random EXC options to any one item.
- Jewel of Level: Allows upgrading one item to +15.
The only way to acquire them is by defeating the powerful boss, Lord of Arkania.
You can find more details HERE.