SRD category for creatures that can be found in any environment, mostly being undead or constructs. One benefit of using these creatures is the avoidance of any need to construct an ecology to support the creature in a believable world setting, a downside is that they are common to high magic worlds rather than magic-rare worlds such as that in most Birthrightcampaigns. The Shadow World gives a convenient explanation for almost any undead while constructs could be artifacts build by legendary mages - or dwarves.
