It might be the biggest expansion ever. Melee skills got a 70% more damage buff. Reflective mist from Kalandra league has been added to the core game. Sentinels from Sentinel league are added to the core game. Wildwood, Warden class, tinctures, and itemized spectre corpses from Affliction league have been added to the core game. Blight maps and Simulacrum have improved rewards. Recombination from Sentinel league has been reintroduced in the current temp league. The new expansion centers around hiring NPCs to automate tasks for you.