From Guild Wars 2 Wiki
Arcane Crystals are a PvP crafting material and represent the second most common of the three arcane tokens. They were used in the Mystic Forge to create PvP rewards.“
Used by the Mystic Forge to produce PvP items.
— In-game description
- Historically, they had chance to be salvaged when using a PvP Salvage Kit on uncommon PvP weapons and armor, found in reward chests.
- Mystic Forge
- Output qty.
- As they were uncommon, they would generally create the second tier of items at a specific rank.
- It was assumed that silver reward chests had the highest chance to drop uncommon items (and thus salvage into crystals), however research into drop rates was incomplete.