After logging countless of hours, I can assure you that I thought I knew everything there is to this game, until one faithful day, someone decided to share a little tip with me while doing Crota on hard. As the raid initiated, my team and I took down all of the enemies down and left a few Knights to make a few orbs, however, while I gazed at oversoul, the patch behind Crota, a knight came down swinging and tearing my back apart, I had a sliver of health left. And then [b]oh forget it, I'm not writing another paragraph, let's get to the point.[/b] -Shooting your own trip mine grenade with the Red Death replenishes your health. Edit: From the looks of it, I'm also being informed that health regen perk can also be activated by shooting any objects that reacts to your shots. -Explosive barrels/yellow boxes -Spike grenades -Lightning grenades Edit 2: Same effects can be achieved with Bad Juju.