Fount of Protection

The Fount of Protection is the most powerful spell of protection that can be cast.

Ingredients and tools

 * One (1) quill made from a feather from one of the elemental birds.
 * One (1) standard inkwell.
 * Powdered unicorn horn.
 * Kraken ink.
 * Fairy dust.
 * Will-o'-the-wisp flame.
 * A glass beaker.
 * Blood from every person to be protected.

Recipe
1. Combine the ink, powdered horn, and fairy dust in the glass beaker, and heat with the will-o'-the-wisp flame until the powder and dust dissolves.

2. Remove from heat, pour into the inkwell, and add a drop of blood from each person to be protected.

3. Using the elemental feather quill, in the northernmost, westernmost, southernmost, and easternmost corners of the area to be protected, write the names of three Immortals, who each respond to those directions. In the northernmost corner, write the name of Boreas/Aquilon, the Grecian/Roman Immortal of the wintery North wind, Texcatlipoca, the black Smoking Mirror Immortal of the Aztecs, and Genbu, the Chinese Black Tortoise of the North. In the southernmost corner, write the name of Notus/Auster, the Grecian/Roman Immortal of the summery South Wind, Huitzilopochtli, the blue Southern Hummingbird Immortal of the Aztecs, and Suzaku, the Chinese Vermillion Bird of the South. In the westernmost corner, write the names of Zephyrus/Favonius, the Grecian/Roman Immortal of the gentle springtime West Wind, Quetzalcoatl, the white Feathered Serpent Immortal of the Aztecs, and Byakko, the Chinese White Tiger of the West. In the Easternmost Corner, write the name of Eurus/Vulturnus, the Grecian/Roman Immortal of the chilly autumnal East Wind, Xipe Totec, the red Flayed One Immortal of the Aztecs, and Seiryu, the Chinese Azure Dragon of the East. Also, in the very center of the house, write the name of Huanglong, the Chinese Yellow Dragon of the Center.

4. When that's done, incant the spell "Dii immortales, spiritus quattuor, oro atque obtestor! Hoc spatium et omnes qui intus sunt protege, et omnes qui sine licentia ingrediuntur graviter patiantur!"

Effects
When cast correctly, the spell will create a barrier around the space that those who gave blood can pass over without issue. If someone who didn't give blood tries to cross, they will suffer a horrible fate, which differs depending on the elemental bird feather that the quill was used is made from. If anyone who did not originally add their blood to the spell wanted to cross the threshold unharmed, then they must add a drop of blood to the line that was created.
 * Earthbird feather: The intruder will transform into a tree or a flowering plant.
 * Skybird feather: The intruder will, quite literally, have their breath taken away.
 * Phoenix/Firebird feather: The intruder will spontaneously combust and burn to ashes.
 * Waterbird feather: The intruder will have their lungs filled with water.
 * Thunderbird feather: The intruder will be struck by lightning.
 * Snowbird/Pamola feather: The intruder will transform into an ice sculpture.
 * Sunbird feather: The intruder will suffer a fatal case of sunstroke.
 * Moonbird feather: The intruder will suffer lunar madness, which causes them to experience highly powerful hallucinations.
 * Rainbowbird feather: The intruder will spontaneously transform into a firework and explode.
 * Shadowbird feather: The intruder will be struck with complete and utter blindness.
 * Stymphalian bird/Metalbird quill: The intruder will transform into a metal statue.
 * Poisonbird/Zhenniao quill: The intruder's blood will turn to acid, and they will, subsequently, dissolve into a puddle.