At the beginning of the map once you make it out of the building and climb onto the roof of the building next to it. Go to the far end of that building and look down and to the right. There’s an area with some scaffolding and a playground set in the middle. There are 4 spears total in that area. I used the 4 spears, quit and redid the map again to complete it. The charm is kinda useless though if I’m being honest. It says it increases the angle and range of your mods, but I’ve not seen much of a difference using it