A Dementor is a Dark creature, considered one of the foulest to inhabit the world. Dementors feed off human happiness, and thus cause depression and despair to anyone near them. They can also consume a person's soul, leaving their victims in a permanent vegetative state, and thus are often referred to as "soul-sucking fiends" and are known to leave a person as an "empty-shell."
The Ministry of Magic employed Dementors as the guards of Azkaban prison, until mid-1996, when Lord Voldemort was sighted in the Ministry, and their defection to his side was realised. The Dementors supposedly led the Death Eaters and Voldemort into the Ministry of Magic. After the end of the Second Wizarding War in 1998, the Ministry was reformed, and Minister for Magic Kingsley Shacklebolt ensured that they were not used by the government again.
There are certain defenses one can use against Dementors, specifically the Patronus Charm. Dementors hold no true loyalty, except to whomever can provide them with the most people to feed off. They cannot be destroyed, though their numbers can be limited if the conditions in which they multiply are reduced, implying that they do die off eventually.
After parking in the designated parking lot you notice that dobby is spooked and has climbed all the way to the top of a nearby tree. You reassure him you will tackle this night cache and scare the dementors away! From here head in a northwest direction till you reach a small concrete patch in the ground very close to a small bench. It is near where the road and tree line meet. From here head in a southwest direction following the treeline. Keep an eye out for the first set of dementors eyes that are 2 white flashers back at you. Enter the wood line here:
Follow the single tacks/square flasher on the trees. I warn you that the tacks are spread out further than normal to add to the difficulty. A HIGH beam flashlight is a must. I also suggest stepping to each side of each tacked tree and looking in ALL directions for the next tack. Remember to following the single tacks till you find the tree with 3 tacks in it. The cache will be within 15 feet if these tacks. Dementors are very tricky and hopefully they do not get you side tracked. Follow the double tacks out to safety.
PLEASE BE SAFE AND CACHE WITH A FRIEND FOR THIS ONE