What: “It shone, pale as bone...” bronze trophy
When: During Year Two (Rubacava), Year Four (Rubacava)
Where: Docks, outside the Limbo
Once you leave Calavera's and proceed down the stairs, a FMV will lure Manny away. When you regain control, you'll be on the dock near Velasco. Off in the distance, you'll see the Limbo to the right and the moon to the left. Start walking down the dock until Manny looks up to the left, towards the moon, and Examine it using
. He'll recite a poem and, before long, Velasco will join in.
EDIT: AtsumaKarin mentions that, should you miss this before boarding the Limbo, you can get this during Year 4 when you return to Rubacava. So this is missable, but you have two opportunities to get it.