Third-age armour is a members only group of armour that is only obtained through completing Level 3 and Level 4 Treasure trails, trading with other players or by buying in Grand Exchange. It is currently the second best non-degradable group of armour in the game. According to Paul Gower, the odds of getting a piece of Third-age armour from a Treasure Trail are extremely rare (according to Mod Maylea, the odds are at least 1 in 100,000 or lower). This armour cannot be made using the Smithing Skill. There are Third-age armours for each combat class, and each class has a specific piece of armour specified for that class:
- Third-age warrior armour (Melee) (shield)
- Third-age mage armour (Magic) (amulet)
- Third-age ranger armour (Ranged) (vambraces)
- Third-age druidic equipment (Prayer) (staff, cloak)
Third-age armour is very expensive, and thus, it is usually worn only to display wealth, as other types of armour give better bonuses and are far cheaper.
Third-age armour generally rose in price after its release until early 2008(add release date). At that point it was bought out in the Grand Exchange for months. Some merchants used the armour as a method to sell partyhats. However, the price eventually peaked and crashed. Since then, the price of third-age armour has become more stable, although the ability of the price to be stable is impaired by the low trade volume and the infrequent price updates (they do not happen every day).
In the behind the scenes July 2010, Jagex stated that they would be releasing elite treasure trails (dropped only by certain boss monsters) introducing over 150 new rewards, some of which would be including third-age prayer armour.
This "third-age prayer armour" turned out to be the Third-age druidic equipment, which has surprisingly low stats and no uses.