I know this is a very noob-ish question however I just got the game about a day ago, so what do the human effigies do? And how are they of any importance? and I'm looking for a co-op covenant so should I join the way of the blue or become a sunbro later on Ps- I'm trying to go in blind but I'm super confused [spoiler]its a lot different from Bloodborne, A LOT[/spoiler]