Serons

Serons are the low class Helds in Ogaron realm. They, as said, belong to the wild tribe of the Helds, though they are never allowed to battle or hunt. They serve as workers - they sew clothes, make tents, cook meat, etc. In the language of Ogaron realm, Danadonian, the word 'Seron' means 'Zero', according to the book I am Held.

Notable Serons
The notable Serons include: Wolvena was known for bringing equality to the Heldic tribe, proving that the Serons could fight just as well as the high class Helds, and that all Helds were born warriors.
 * Wolvena Nillin

Conclusion
After Wolvena's heroism, the word 'Seron' disappeared from the Heldic vocabulary. The only distinguishing sign between high and low class Helds was the title 'von' the high class Helds had in their family names. Otherwise, both the high class Helds and the former Serons had the very same rights.