Rally Banner
From Destinypedia, the Destiny wiki
Rally Banners are banners that can be placed at certain locations, typically before the beginning of a Raid encounter. Interacting with the banner once it is placed will grant the player full ammunition to all weapons as well as recharging all abilities and Supers.
They can be purchased for Glimmer or Legendary Shards at Suraya Hawthorne in the Tower (Destiny 2).
As of The Witch Queen there exists 2 types of Rally Banners;
- Raid Banners which appear as Legendary rarity items that can be stored in your inventory, and used before any raid encounter to allow fireteam members to gain Super energy and Heavy ammo.
- Campaign Banners which appear in Story instances like Campaign missions, and some Exotic missions with Vox Obscura being an example alongside Starcrossed, these banners are free to use and function just like Raid Banners but are not stored in your inventory.