Seren's symbol

Seren's symbol is a necklace made by combining an incomplete Seren's symbol (bought from any of the Prifddinas clan heralds for coins) with the eight clan symbol pieces, obtained by pickpocketing the respective clan workers: All symbols are also a possible rare reward from the Hefin Agility Course.
 * from Amlodd workers
 * from Cadarn workers
 * from Crwys workers
 * from Hefin workers
 * from Iorwerth workers
 * from Ithell workers
 * from Meilyr workers
 * from Trahaearn workers

When completed, you can click it to gain 15,000 experience in the 18 Prifddinas skills (Agility, Attack, Crafting, Construction, Divination, Dungeoneering, Defence, Farming, Herblore, Magic, Mining, Prayer, Ranged, Slayer, Smithing, Strength, Summoning and Woodcutting), for a total of 270,000 experience. Similar to the tuska mask, it can still be worn as a cosmetic item after being used for experience. It is not needed to destroy any other symbols to gain another 270,000 experience from making another necklace. Completed necklaces can be banked with xp saved for future use.

You can use the completed symbol on any of the Heralds for some additional dialogue. They express some disbelief and dismay that they were not the ones to discover how the Symbol worked, but ultimately thank the player for showing them.