While I'm not against an alliance with the fallen, story wise it's not feasible, the atrocities the fallen have committed against civilians, I'm sure there are many who hold a grudge, and I'm sure the feeling is mutual since guardians and the awoken are responsible for the deaths of countless enemies Plus we can already get our hands on fallen wepons, queen breaker is a wire rifle, dregs promise is a shock pistols and Lord of wolves is a shrapnel gun