Simply something made undead with no further changes to what that thing was, nothing special. Any organism can be brought back as a Risen. They still possess properties of their former life such as intellect and abilities and some properties of undead, however become sterile and cannot reproduce. They could have a stench, some rot or the ability to spread disease. This class does not lean towards any of the following classes because it quite simply is whatever that thing was before they died. Their soul/spirit returns to their body through unholy resurgence and they are now simply classified as an undead. Examples: Undead Pig, Undead Isan’i, Undead Lycaon, etc.