Skeleton Key
From Destiny 1 Wiki
Skeleton Keys are randomly dropped after completing Nightfall Strikes and Strike Playlist. Skeleton Keys can be used in Strikes with exclusive rewards to get a guaranteed drop. At the end of the Strike, a new chest called, Strike Hoard, will appear. Skeleton Key can be used the open the Strike Hoard to obtain an exclusive reward.
- Skeleton Keys were introduced in Rise of Iron expansion.