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After taking the garrison shown in this video. X:519.9, Y:365.6 You can accept a Predator's Path quest to kill turtles befriending rats in the sewers below. The Turtles have their eye areas painted colors to match each TMNT member. While there is no sign of the rats they seemed to befriend they do have traps guarding them and may or may not be highly skilled assassin's.
At coordinates X:530.6, Y:321.5 you will find a scientist who had to much to drink
The Ruins at X:478.7, Y:487.9 have a special guest just waiting for a hug!