"You do not sink in black water. You are eaten by it."
Such has been said about the mysterious and even moreso rare lake within the Web of Amida. While not truly being a lake, the Swamp itself is known to house far and inbetween pools and puddles of sinister and evil liquid. This liquid, for all purposes, acts exactly like water, save for the fact it is as opaque as tar and not able to be controlled by man, through jutsu or otherwise. It is rare for someone to actually see it in person- it is often imitated and feared in the same level as quick sand. It is said that those who are submerged with it however, never arise again, and that those soaked with it go insane.
That being said, skeletons have been found littering the areas around these pools and puddles, and even stranger are the fact the skeletons are black, as if dyed so with the darkest dyes possible, but not so by the water.
A small tribe of wandering nomads exist in the most southern edges of the Swamp - your mission from the Mizukage is simple. Take their skeletons, by force, and drop them into the pools, the more the merrier.
You have 18 posts to your task.