Nightmare Land

I would say this is a place for Tier 3 players and over. It have a lot of re-spawns and mobs have a lot of HP and its making this area less popular for grinding. You can get all mats for Halloween event in that zone. You can access by using a scroll of nightmare lands or by buying Scroll of teleportation - Abyss Lake from Caroline in -Warp 8

Pros: You can collect nodes, Haunted Gear X from drops

Cons: Mobs with a lot of HP