| #01 : Only pure-blood vampires can turn humans into vampires. Hybrids (Vampire × Non-Vampire) cannot. |
| #02 : Incest marriages are still common among pure-blood vampire families to preserve the purity of their bloodline. |
| #03 : Female vampires can have children with both vampires and non-vampires. If the other parent is a different species (for example, a werewolf), the child will inherit only one parent's race/abilities. A Vampire × Werewolf child will become either a vampire or a werewolf. There has never been a case where a hybrid child has inherited two of its parents' traits or abilities. |
| #04 : Vampires are known for their breathtaking beauty and are often described as living works of art. |
| #05 : Some vampire clans and werewolf packs are still enemies because of their ancestors' long history of conflict. |
| #06 : Vampires always complain that werewolves smell like rotting garbage, while werewolves say vampires smell like overly strong perfume that is sickening and allergy-inducing. |
| #07 : Imprinting is more than choosing a mate—it's choosing a soul to protect. It has always happened with humans, until one werewolf imprinted on a Pure-Blood Vampire older than his tribe's own legends. Both vampires and werewolves saw it as an impossible bond, though for very different reasons. |
| #08 : Pure-blood vampires naturally have cold body temperatures. Hybrids are much warmer—hotter than humans but still cooler than werewolves. |
| #09 : Unlike pure-blood vampires, who are uncomfortable under sunlight, hybrids can usually stay under sunlight or artificial light without any problem, especially those with human ancestry. |
| #10 : Vampires who replace human blood with animal blood or blood capsules are called Vegetarian Vampires. They were once extremely rare until Gallahan Ravenscroft introduced and spread the use of blood capsules. |
| #11 : Gallahan developed the blood capsules with a human partner. The capsules are only distributed within their own community and the vampire hunter association. |
| #12 : Vampires usually need to drink blood every 2–3 months. If they wait longer, resisting the temptation of sweet human blood becomes much harder. Gallahan is an exception. He has never relied on human blood unless he intentionally wants to turn someone into a vampire, which he rarely does. |
| #13 : Newly turned vampires are usually violent and extremely dangerous if left unsupervised. Their overwhelming hunger often overrides their ability to think rationally. |
| #14 : Witches, summoners, and many other creatures that humans consider myths or legends also exist in this universe. They live peacefully within their own communities. |
| #15 : Hybrids, especially those born from a human parent, can survive on normal human food and drinks. |
| #16 : If a hybrid vampire develops inside a human mother, the pregnancy is extremely dangerous. The baby's supernatural strength often damages the mother's body. As the pregnancy progresses, the mother usually becomes unable to eat or drink normal food and slowly wastes away. The only food her body can properly accept is human blood. |
| #17 : Childbirth for a human mother carrying a vampire child is incredibly risky. About 90% of these pregnancies end in the mother's death. The only known way to save her is to turn her into a full vampire before she dies during childbirth. |
| #18 : Every vampire and vampire hybrid has a different level of self-control around blood. As long as Roseanne's own blood level is normal, she can control herself. However, if there is heavy bleeding—or if she is close to her feeding time—controlling her vampire instincts becomes extremely difficult, almost impossible. |
| #19 : Vampires are considered immortal, but they are not invincible. They can be injured and killed if their heart is pierced with a weapon made of pure silver that has been blessed with holy water. However, this is extremely difficult, as most vampires and vampire hybrids possess abilities that allow them to protect themselves. |
| #20 : Unlike humans, vampires and other non-human beings age at different rates. They continue to mature over time, but their aging ultimately ceases at a predetermined stage. |
| #21 : will added if any new trivia found. |