User blog comment:Jarcellon/Soul Farming Locations/@comment-11923066-20130402180121/@comment-6003396-20130403004040

also, the Symbol of Avarice stacks soul bonuses with the silver serpent ring. and this is mentioned on either one or both of those pages: after killing a boss, there is a short window before the souls are rewarded. in this time one can quickly equip both for a 40% boost in souls.