Bungie decided to make new Arsenic Bites have fixed perks, without testing the effect on existing bows. Basically where previously you had a choice between Explosive Head and Archer's Tempo perk you have now lost Explosive Head as a choice... So I'll say it again, t[b]hey made a change to this weapon for new bows without testing the effect on existing bows[/b] Pretty much par for the course at this stage, nothing is properly tested and the dev's don't play the game so general incompetence is to be expected