The hidden shard is used to make the support cape and support hood. It is occasionally obtained by players with 99 Thieving when training Thieving. When combined with the daemonheim shard (Dungeoneering), deadly shard (Slayer) and agile shard (Agility), it will turn into the support cape and hood. The cape has the same bonuses as other Capes of Accomplishment, but it comes with a different emote and boosts all relevant skills to 100 when operated.
Note: If you do not have space in your inventory, you'll get the message: "You found a shard emanating magical energy as you were training, but there was no space in your inventory to take it." The shard will also not appear on the floor.
A hidden shard can be obtained by performing any action that can yield a strange rock.
If a player owns the expert skillcape shard bag, the shard will automatically be added to that bag, even if it is in the bank.