- Irregular Physiology (Monsters physiologies show they are mostly made of magic[2], noting that humans have a "physical form"[2], along with having their SOUL directly attuned to their body[2])
- Magic (All monsters are made of magic and can use and express themselves through magic[2])
- Curtain Fire (Monsters can use their magic to make bullet-pattern cards[2]. Monsters are able to develop a large sum of magical attacks to overwhelm the opponent[6])
- Creation (Monsters can make weapons[7], clothes and even food from magic)
- Personal Domain & Battlefield Removal (When one encounters a monster they get into a fight[8], a FIGHT is an encounter in a monster's personal domain allowing them to fight humans, this has various rules such as turn-based combat[9])
- Limited Spatial Manipulation
- Absorption (Monsters and humans can absorb the SOUL as long as the person isn’t the same species as them[13])
- Non-Standard Interaction
- Metaphysical Interaction: All monster attacks in Undertale are to the SOUL[14].
