Classification: Demon
Threat Level: High
Weakness: Slashing attacks, holy water, possibly water magic and specialty crossbow ammunition.
Notes:
Abyssal demons are Chthonian demons from the abyssal plane, as their name suggests. Any competent mage will also tell you that teleportation spells route through the abyss. The clever readers may have already guessed how those two points are relevant. They teleport. A lot. And sometimes not just themselves. Skilled slayers are able to predict where they may teleport next, placing their weapon there and allowing the demon to do the rest. They have a fondness for whipping intruders with their numerous, glowing tendrils, or biting them with their toothed maw. Bring either specially enchanted mage gear or metal armor for best protection.
They are weak to slashing strikes, provided that you are skilled enough to hit them. Some mages swear by water spells, but I have never been proficient in magic so I am unable to confirm this. Likewise there are rumors of special bolts that are capable of hurting them effectively, but I have never seen anything like it.