Mamono ('''魔物''') is a [[Languages|Youkai-go]] term which means "evil spirit". It is a category of creatures that have appeared in the Mazes alongside [[youkai]], which possess a range of magical abilities and traits. Whereas youkai are sapient, civilized creatures that have integrated into society and communities, mamono are feral monsters residing in the Uncivilized Area, being one more category of dangerous creatures that can be found there.
Shinigami is a Youkai-go term which can be transliterated translated to "death god", but another popular translation is "grim reaper". These ominous terms are an accurate representation of this creature's capabilities, which are all oriented towards inflicting death upon other creatures, either slowly through the use of their unique ''withering clouds'' ability, or quickly, through the use of their scythe and other magical abilities, such as the ''Force bullet'' and the ''Energy slash'', which allows them to throw waves of energy using their scythe, cutting and rending anything it touches.
Despite these abilities, shinigami do not have the reputation for being violent, brutish, or even hostile towards other creatures. Not only are they sapient and capable of speaking [[Languages|Common and Youkai-go]], but they are also intelligent, rational, and many will happily strike a conversation with adventurers and passers-by that happen to meet them, should they wish to talk rather than fight. If you speak with a shinigami, you will usually find a very polite and soft-spoken creature who rarely ever raises their voice.