Just reached the 3rd step of the "Refractory Warrior" triumph of Solstice of Heroes and noticed that we need to kill 60 more bosses (apart from the previous 40). This is bad enough, until you notice that this only counts on PRISM day. How is this reasonable? This will take hours upon hours in very specific days. Edit: Thank you to all that pointed out that the Taken bosses also count. This helps alot, inded. However, the "only on PRISM days" argument still holds and maybe should be reconsidered by Bungie.