Elders' Sigil
From Destinypedia, the Destiny wiki
An Elder's Sigil is a quest item that is used to gain access to the Challenge of the Elders arena mode of Destiny. It costs 2500 Glimmer and resets every Tuesday, following the reset. There are two sections a player must fulfill in order to redeem the card for loot: the first requires the fireteam to obtain a total score of 30,000 points in one playthrough, and the other requires a total score of 90,000 points over multiple runs. Completing a sigil makes a player eligible for a random House of Judgement reward in addition to whatever loot the player earns during their runs.