Arcane sigil shards are item shards received from the Corporeal Beast when an Arcane sigil is dropped while CoinShare is active. 120 shards are divided up equally among the players who killed the monster and sent directly to their bank. The shards can then be sold on the Grand Exchange or to other players, and 120 of them can be combined into an Arcane sigil.
The profit for combining 120 shards and selling the item in the Grand Exchange is as follows:
|120 × shards||2,892,000|