In Saldecla, there are many monstrous species. Many of them are aggressive against humans. Monsters are categorized into three categories: dark, neutral, and light. Their categorization is based solely on the mentality of the species as a whole.
Dark monsters tend to have attitudes that are very aggressive and antagonistic. If they see a human, they will attack or try to otherwise disturb it for selfish gains.
Neutral monsters are often too mindless to be either selfish or altruistic, and simply do what their instincts tell them to do. In rare cases, they are neutral by choice.
Monsters who are classified "Light" are benevolent towards humans and primarily utilize positive magics of healing and protection. They will typically attack only if provoked, and enjoy peaceful coexistence. These are not common, because they are also attacked by dark monsters.