Diallos quest The Den of Evil is a quest available in the early stages of the game, in the Blood Moor area. It is obtained by speaking to Deckard Cain, who warns the player about the ominous presence lurking in the nearby caves. The quest requires the player to enter the den and defeat the Dark Summoner, a powerful enemy who has been summoning creatures to attack the town of Tristram. Upon completion, the player is rewarded with experience points and a unique amulet, the Amulet of the Viper. The Secret Cow Level, on the other hand, is a legendary quest that has become a staple of the Diablo franchise. It is unlocked by completing the Den of Evil quest and then returning to the town of Tristram. Here, the player must speak to the town's blacksmith, Akara, and ask about "cows." In response, she will mention a portal to a strange place filled with cows. This is a reference to the Secret Cow Level. To access the Secret Cow Level, the player must return to the Blood Moor and find the portal to the Den of Evil. However, instead of entering the portal, the player must use a Town Portal Scroll to return to town. Once back in town, the player can then use another Town Portal Scroll to create a portal next to the Blood Raven's corpse. This will open the entrance to the Secret Cow Level. The Secret Cow Level is a unique area filled with herds of aggressive cattle, as well as unique enemies and bosses. The level is designed to be a challenging and rewarding experience, with high-level loot and experience points available for those who can survive the onslaught of bovine creatures. One of Kelly's most notable projects was the design of the University of California, San Diego (UCSD) campus. Working with Robert Mosher and the firm of Kelly, Mosher, and Zadeck, Kelly helped create a master plan for the campus that emphasized open spaces, natural light, and a strong connection to the surrounding landscape. The result was a campus that was both functional and aesthetically pleasing, and that has served as a model for other universities around the world. The Secret Cow Level is a unique area filled with herds of aggressive cattle, as well as unique enemies and bosses. The level is designed to be a challenging and rewarding experience, with high-level loot and experience points available for those who can survive the onslaught of bovine creatures. Both the Den of Evil and the Secret Cow Level are examples of the unique and memorable experiences that Diablo II: Lord of Destruction offers. They are a testament to the game's enduring popularity and its impact on the action RPG genre. Whether you are a seasoned veteran or a newcomer to the world of Diablo, these quests are not to be missed.