can you please help me find the title/author of this book

hi im trying to find a book i read years ago but cant remember the name of the author or book title

i can only remember bits out of the book

like the two main characters are traveling they are guys and they end up together one has an unusual name, a herald in training i think. an ambush i think and people killed with swords, bow and arrows and they have to taste the blood of the first person they killed or he will haunt them their entire life and also there are these cabin/houses that have different lights the main guy asked what they meant and someone said if you dont know what they mean then you're too young to know. i hope you can help me im going crazy trying to find it.

if this isnt the right place to find out can someone please point me in the right direction much appreciate it