Stress Relief. This'll be the last one unless they decide to nerf Gunpowder Gamble (hopefully not) or buff it even more. Note this has been in the game since release of solar 3.0. The extra fragment slot just lets you keep both Ember of Torches and Empyrean now.
00:00 Solar Fragments
00:28 Just throwing grenades
01:06 What Char+Ashes will actually enable for GPG
01:55 Just throwing more grenades