https://www.polygon.com/2017/11/7/16619912/destiny-2-second-faction-rally-weapons-start-end-date

Today marks the beginning of Destiny 2’s second Faction Rally, offering players the opportunity to pick a side and bring one new weapon into the game. Unlike last time, however, the decision goes a bit deeper than good looks versus good stats.

Dead Orbit is offering a nifty little grenade launcher called Truthteller. At first glance it looks to be a reshade of the existing legendary called Flash and Thunder, which is pretty underwhelming. But, if you look closer, you can see that it has a greatly increased blast radius. Coupled with the Concussion Rounds trait, which staggers enemies, this could be just the thing for pesky mobs in high-level raids.