Carried my friend (lvl 30, <1 day played) through the nightfall 2 weeks in a row. Both times he got Gjallahorn while I got the hard light and a 55a-allfate. (shitty guns by the way) my other friend (lvl 31, a little more than 1 day played) first prison of elders chest was a gjallahorn. For me it went in a row, (1) Truth, (2) dragons breath, (3) Universal Remote. I have almost 8 days played with all 3 characters combined and no gally, have done plenty of nightfalls and raids and everything else I could think of but nothing but crap. Now I know that I'm never gonna spend money at a casino...