I, Singing Scribe Monty Morris of Cantalby, am writing this primer so as to educate the uninformed adventurers of the properties of the entities known in layman's terms as 'monsters'.
Before I can begin, however, I must clarify a common misconception. What are commonly referred to as 'monsters' are nothing of the sort. Calling a Nareevian Sicklecat a monster is no more correct than if one were to call a machine man, it is simply a misnomer. A monster is only a monster if it is made out of a substance known as 'sludge'. Sludge is black in color, syrup-like in motion, and sticky to the touch. Sludge on its own is only dangerous to the few unlucky enough to be born with an allergy to it. However, when enough sludge is allowed to pool together, it hardens into a 'monsterhive'.
Monsters come in many different forms, with each individual monster being unique. Some are big, others are small, but all have a ravenous appetite for sludge. Most of the time, monster infestations keep themselves in check as they devour and cannibalize in an endless cycle. Unfortunately, if a monster finds itself starved of sludge, they may attempt to feed on other entities and discover the ability inherent to all monsters: the ability to convert living matter into sludge upon digestian.
Among scholarly circles, monsters that have learned this facet of their reality are referred to as 'enlightened monsters'. Enlightened monsters on their own are not especially dangerous, not when compared to the predators that often lurk at the fringes of campfires. The problem comes when a 'spark-eyed monster'—a monster significantly more intelligent and capable than their fellow monsters—learns of their ability to turn living matter into sludge. Should this happen, spark-eyed monsters will invariably leverage this knowledge to create a sort of 'cult of personality' around themselves. In order to grow and propagate this cult, the spark-eye will desire to create as much sludge as possible.
A rare few spark-eyes will realize that making deals and striking accords with the local population centers is the superior way of expanding their cults—as is the case with Warlord Sar-Rasta in the minor oasis of Mottle—but the vast majority of spark-eyed monsters will simply kill and slaughter whoever is so foolish as to come too close to their territory. As such, they pose significant threat to unwary passerby.
Fighting monsters is, oftentimes, an exercise in futility. Monsters have no uniform weakness and no uniform strenghs, making every encounter a new one. No monster is exactly the same as any other monster and, unless they are fresh spawnlings, will have developed tactics and strategies to wield their innate armaments to their fullest potential.
You, dear reader, may find yourself dispairing should you be in the proximity of a monsterhive. If this is the case, worry not! Sludge cannot convert active ka into more sludge and, in attempting to do so, causes a sort of 'cascade effect'. Attempting to ingest active ka forces the sludge to spontanuously combust thanks to the heat generated by it trying to convert ka. In order to destroy a monsterhive, one must dump enough active ka into the 'spawning pool'—a central chamber from which all spawnlings, the first stage of monster biology, first emerge—so that the entire monsterhive comes crashing down. As long as one prevents any remaining spark-eyes from getting clever and attempting to construct another monsterhive, your monster problem will eventually end as the monsters cannibalize themselves or are killed in the attempt.
Some brave warriors even make a living out of this! Not only will villages often pay a princely sum for the removal of a nearby monsterhive, but monsters only ingest living matter, leaving the wealth and riches of their victims fully intact. As sludge has excellent preservative properties, the potential loot can stay pristine for generations!