Destiny Loot Cave Location - Dying Light Easter Egg
The Destiny Loot Cave is found in the northeastern most portion of the Slums along the coastline. In order to get here head over to the Fisherman's Village on the coast and then follow the coast directly north until you stumble across this location up in the mountains. Use my map location below if you need help finding the area.
What you're looking for is a boarded up section by a cave entrance at the end of a river (pictured above). You can swim under water through a small cave mouth until you come across an open cave with a small island in the middle along with a patch of land with a few bags and a chest.
Approach the chest and you will begin the event that takes place in this cave; when it activates you'll get the following dialogue:
"Your destiny is to build your legend (and get loot)."
Zombies will spawn and attack you, there will be a couple waves of them before you get the next line of dialogue:
"Enough! Patch 1.0.2 activated. Better do some quests."
No more zombies will spawn and that will be the end of the event. Your reward will be 1,000 Survivor Points for completing this event. As far as I am aware there is no way to repeat the event twice on the same play through. You can explore another section of the cave by crawling through a small hole in the wall. The location of the hole can be seen in my Youtube video below.