The Krylock Demon

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The Krylock is a demon that appears in the Season 2 episode "Half Baked". It is a beast of pure evil that feeds off of magical creatures (like Unicorns). It has the head of a cobra and the body of a scorpion. It is also interdimensional, meaning that it lives in another dimension. The only way it can go to Earth is if it passes through a dimensional door, which can pop out anywhere at anytime. Because of this, it is impossible to track.

Its home is a wasteland of lava and rocks, possibly the interior of a volcano or a place similar to the Underworld.

Venom
The Krylock's scorpion tail is where the demon stores its venom. When extracted, it will come out green in color and will have a slight glow. This kind of venom is, according to Fu Dog, a key element to making a successful portal spell. And indeed, if the poison is omitted or replaced with another substance (such as vanilla), the spell will only create a useless, dead-ended dimensional door.

If consumed by humans (including Dragons), the venom will infect those who ingested it by giving them Krylock properties. In most cases, victims will grow fangs, a slithering tongue, pincers, a scorpion tail, sometimes even scorpion legs, and their eyes will become reptilian like those of a snake. They will also gain super strength and start a rampage out of savagery.

Because they are humans under a magical influence, those who consumed some of the Krylock venom cannot be defeated the conventional way. Since the poison's power comes from the beast itself, it is primordial to first slay the Krylock to avoid harm upon the human victims. Once the Krylock is defeated, its venom's effects will disappear, turning everyone who was affected by it instantly back to normal. The victims will also have no recollection of ever being under its influence.

Ironically, the Krylock's demise is its own poison, driven through its heart from its scorpion tail by Jake.

Trivia
The Krylock is apparently so evil that even its hologram will try to attack people (like Spud). It is even shown eating a harmless Leprechaun in a single bite. Victims of the Krylock poison still have the ability to talk, though most will just hiss and roar. When infected by the Krylock's poison, Haley is seen spitting some green and glowing goo that burns through a picture frame like acid. It is unclear if this is a Krylock ability or just an effect of its venom. One victim of the Krylock venom developed a tongue with a secondary mouth, a reference to the creatures showcased in the "Alien" movies that have this same property. Although the Krylock lives in a world of lava, it is vulnerable to fire.
 * The Krylock Demon is one of the Top 13 Threats to the Magical Community.