Requires these mods: Origins and Fabric API.
An Origin I made for the official Halloween Jam. Below is ripped directly from the Origins discord where I first posted it.
What Is Frightened?
All of the below feed nearby Glykushi, with rising speed depending on the number. (3 is a little slower than 2 because 3 lasts very long)
Frightened 1 makes you randomly see pumpkin hallucinations every few seconds and makes glykushi deal a little more damage to you
Frightened 2 lasts longer than frightened 1 and puts a weak pumpkin overlay on your screen, nauseates you, blinds you and makes glykushi deal more damage to you.
Frightened 3 has all the effects of 2, but the overlay is stronger, you are slowed for the first few seconds of frightened 3, glykushi deal even more damage and it lasts longer. Frightened 3 also does the elder guardian jumpscare when inflicted.

THE POWERS LIST! (there is way more info on the powers in-game)
🔴 Stress: You have a stress meter which must be kept down by inflicting fear (more detail on what is inflicting fear in the actual description in-game), eating candy or being around Frightened things.
🟢 Trick Or Treat: By pressing your primary while sneaking, you consume 5 candy and create a Treat that, when touched by anyone other than yourself, buffs and gives 5 candy to the toucher. When pressing your secondary while sneaking, you create a Trick. Tricks deal damage upon contact with any non-glykusho and inflict Frightened 3.
🟢 Candy Basket: You can collect candy in this basket, which you can eat by pressing G. Eating gives you speed and half a hunger chicken leg. You lose 20 candy upon death. If there is a glykusho nearby, that candy is given to the glykusho.
🔴 You cant eat any food besides hunger and fear.
🟢 BOO!: You knock back everything near you. For each villager knocked back, you gain some candy. Inflicts frightened 2.
🔴 Large Appetite from the Shulk
🟢 Halloween costume: when wearing a full set of lime dyed leather armor and a creeper head, your nametag becomes invisible and Boo becomes a creeper explosion. Wearing a skeleton set or zombie set also gives you buffs related to that mob.
🔴 Fragile. 3 less hearts
🟢 Fear Shroud (may say its an active ability on origin select screen, its not.): When low on health or stressed, you enter Fear Shroud. If Fear Shroud was entered because of low health, you gain invincibility for 5 seconds. If Fear Shroud was entered because of high stress, you lose some stress. During Fear Shroud, press space while in mid air to dash. (has cooldown) Does not work while elytra flying. You cannot wear armor or hold a shield during Fear Shroud. After entering Fear Shroud, you cannot enter it again for 40 minutes.

DEPRECATED
I no longer support this origin.