Something i haven't seen discussed anywhere and it makes me think if i'm the only autist who's wondered about this:
What happened to the angelic rifle left behind by Striker after failling to kill Stolas in season 1? Why not bring that back for their fight against Andre, who can only be truly harmed and killed by such weapons? Had Octavia not intervened, all of them would've died. Do angelic weapons have a shelf life and stop being "blessed" after some time? Is the rifle itself "blessed" or just the bullets? Or is it both? If it's just the rifle, can you fire any kind of ammo, and it'll come out as blessed anyways? If it's just the bullets and the appearance of the rifle is merely aestethic, did that rifle only have 1 bullet that time it was given to Striker? That's the only reason i can think of why they didn't brought it back, but since the series itself never bothered to answer these questions, this might as well just be a headcannon, which are worthless when talking about the series' plot.