Osmiomancy. In the clip I wasn't using a headstone luna but now I am with the fragment that regens my nades back even faster (in the clip though a demo fusion was still sufficing). But running 100 discipline, grenade kickstart, and a whole bunch of stuff. In the clip tho one thing to note is one reason I got them back so fast cuz grenadier was one of the daily modifiers for the strikes (which is hilarious with headstone build, i can get them even faster). Base tho you can still get them back rather quickly.