From Dragon Quest Wiki

The Necropolis is an underground labyrinth found in Dragon Quest Monsters: Joker 2. It is the ninth area accessed in the game.


The Necropolis is filled with stout monsters roaming a subterranean landscape that twists and turns back on itself repeatedly. The monsters encountered here (including liquid metal slimes) are tougher and higher-ranked than the monsters in almost all other places before, providing plenty of experience. The only other section harder than this is the Dark World, unlocked after beating Leonyx.