CASTLE OBLIVION:
Castle Oblivion is an Oblivion-aligned area on Anegio. Not to be confused with this Castle Oblivion.

The castle, on the outside, is pitch black, while the inside is stark white. The basement has an exit, but leaving through there means a potentially-fatal free-fall to Newerth.

The doors are all locked, and only special cards can open them. The layouts are generally the same - white rooms, one of which have a staircase to the top - but the ruler of the world, Malice Oblivié, is capable of changing it at will, or having it change based on the memories of a person within the castle.

Each illusory area appears as it would in the real world, split into rooms. However, on entering the area, they will emerge into one of about four rooms (it varies from area to area; the Lunar Soul Castle would have only one entry point, while Gomu Forest would have three).

Heartful under Malice's command guard the castle against intruders, ever since Anubis was vanquished around 20 January 2015.

Battles in this Castle Oblivion do not require cards. They are as normal as outside of the castle.