Buy RS3 Crystal weapon seed
The crystal weapon seed is a members-only item in RuneScape 3. It is used in crystal singing to make a crystal weapon. When a crystal weapon runs out of charges, this seed is what is left behind.
After finishing the Plague's End quest, players can take the seed to Eluned in the Ithell Clan district of Prifddinas. She can sing it into a Melee, Magic, or Ranged weapon. Magic options are the staff, wand, and orb. Melee options are the halberd, dagger, and off-hand dagger. Ranged options are the bow, chakram, and off-hand chakram. Her fee starts at 1,000,000 coins and drops to 200,000 as the service is used more. Before Plague's End, Ilfeen can turn the seed into a crystal bow for 180,000 coins or a crystal shield for 150,000 coins.
Players with level 75 Crafting can also use the seed with harmonic dust at the crystal bowl in Prifddinas. This needs The Eyes of Glouphrie and Plague's End quests done. Two-handed weapons use 750 dust and give 750 XP. One-handed weapons use 375 dust and give 375 XP. The seed is tradeable and weighs 0.014 kg.