I need to understand Path of Exile's character specializations, called Ascendancy classes. How are they unlocked, how are they structured, and what are the main benefits and characteristics of the Slayer class?
Navigate to the 'Game' section of the website. Click on the 'Ascendancy Classes' link. Read the introductory text to identify how Ascendancy classes are unlocked and their total number. Click on the 'Slayer' Ascendancy class link under the 'Duelist' section. Summarize the key features and benefits of the Slayer Ascendancy class from its dedicated page.
State that Ascendancy classes are unlocked by completing the Lord's Labyrinth. State that there are 19 Ascendancy classes in total. Provide a summary of the Slayer Ascendancy class's primary characteristics, including its focus on offense, survivability through leeching, and specific bonuses like increased Attack Speed and Damage while Leeching, and Critical Strikes.