Monsters are creatures who lived in a world that was absorbed by the Fracture in Reality ; this exposed these once-normal animals to Chaos Energy that mutated them into fantasy-style monstrosities. For example, monkeys exposed to Chaos Energy generally become Goblins.
Monsters don't have Classes, but their Chaos Energy ("organized chaos") functions much the same, causing them to gain Levels over time. The more Levels a monster has, the more physically developed it is, so faster-Leveling monsters will reach sexual maturity before other members of their species and therefore will outcompete their peers. Or so you'd think.
The trouble is, monsters can sense the Chaos Energy inside other monsters around them. This is because magic in my world is symbolic; this "Chaos Sense" is like recognizing kindred spirits for us humans.
Obviously being able to sense fellow organisms is going to change the predator/prey relationship, and considering monsters hold both beneficial and detrimental (even lethal) Enchantments, it seems monsters will evolve a more precise Chaos Sense, that allows them to not only distinguish friend from foe, but to distinguish beneficial and harmful Enchantments in fellow monsters.
After that, it's not hard to see monsters evolving more and more precise Chaos Sense, allowing them to tell a monster's species, Level, and perhaps even Stats (Strength, Agility, Health, and the like). My question is, therefore, How Will Chaos Sense Impact Monster Ecology?
Clarification: A monster sensing another monster's presence is due to Chaos Energy; as all monsters have this in common, it gives them a certain connection that not only allows them to sense each other but may also allow them to perceive something of the other monster's nature, depending on well the monster's Chaos Sense has been developed through natural selection.
On Levels: "Seeing" another monster's Levels is like you guessing a person's age; by looking at a person's size and so forth, you can get an idea of how old they are. Thus, monsters can get a rough idea of how strong a monster is compared to them, but this aspect of Chaos Sense can be easily fooled.
On Stats: Practically self-explanatory. You can just look at most monsters and immediately see their strongest and weakest stats. An obese but jacked troll, for example, will have incredible Strength and Constitution but horrible Speed.
Given the above on Chaos Sense, it should make sense that monsters can sense the strengths and weaknesses of nearby monsters; sensing a gargoyle as strong and tough but slow and lumbering, for example.
On Enchantments: Once again, given what I've said on Chaos Sense, monsters being able to get an idea of what Enchantment (or Enchantments) another monster holds shouldn't be a huge stretch. It's really not so different from an animal identifying a berry as poisonous; if a Chomper encounters a Plop, it should be able to see with its eyes and Sense that Plop are rubbery creatures, flexible yet firm, and that killing one will make its own body rubbery.
If these examples aren't enough, let me know and I will attempt further clarification.