Legends tell of a vampire named Gulthias who worked terrible magic and raised up an abominable tower called Nightfang Spire. Gulthias was undone when a a hero plunged a wooden stake through his heart, but as the vampire was destroyed, his blood infused the stake with a dreadful power. When a vampire is killed by a wooden stake to the heart, if the stake is not destroyed but is discarded or left in the body of the vampire, a Gulthias Tree can take root and blights will follow.A Gulthias Tree grows differently than most plants. The roots at the base of the trunk are oftentimes exposed to the air in a large mound that blights bring dead creatures to for their blood to run over the roots. As it grows larger, it creates an unnatural darkness that eventually blocks out the sun, killing any vegetation that grew there. An adventurer venturing into this area would notice the natural light get dimmer as they approach the Gulthias Tree no matter what time of day.A Gulthias Tree is capable of speech, but any thoughts it forms takes twice as long as most sentient species and can only speak through telepathy. The tree prefers not to speak as doing so takes considerable effort. Killing most creatures is easier than trying to talk to them. A Gulthias Tree's lair will be located wherever the tree took root. Being unable to move, the defenses around the lair are what prevent most things from harming the tree. This roughly circular lair will be surrounded by a thick wall of thorny brambles and vines. The area in and around the lair will be devoid of any animal life but will be teeming with insects. Fire beetles climb among the branches of the canopy and along the Gulthias Tree itself casting a dim light. A fully grown Gulthias Tree will have a massive root mound up to ten feet high at the top and extending as far as 20 feet from the trunk. The outer surface of the mound will be virtually solid, while the space underneath can be climbed into. Any indigestible parts of it's food will generally be found there. On initiative count 20 (losing initiative ties, the Gulthias Tree takes a lair action to cause one of the following effects; the tree can't use the same effect two rounds in a row.-Magical fog billows around one creature on the ground within the lair. The creature must succeed a DC 14 Wisdom saving throw or be charmed by the tree until initiative count 20 on the next round. -1d4 Needle blights emerge from the edge of the lair and attack any creatures not controlled by the tree.-The thorny plants around the lair lash out against any creature not controlled by the tree within 10 ft. of the edge. If the Gulthias Tree dies, any creatures it was controlling will flee or become docile. In addition, the unnatural darkness will slowly dissipate over the next hour. While cutting down a Gulthias tree will stop any immediate threat to adventurers, if the wooden stake underneath the center of the tree is not destroyed, it will eventually grow back. An encounter with a Gulthias Tree with a lair has a challenge rating 4.