The crazy stalker

Sudden Rush:

First, you hear a dragon’s growl, a Warden’s roar, and a Ghast’s shriek from a distance. About 2.5 seconds later, the Stalker appears 60 blocks away and streaks past from the side at 4–5 times the speed of a sprint. It passes through walls—whether in a forest, a cave, or on a mountain.
Every block within a 3x3 area along its path is destroyed, and any living creature in its way dies. You can disable this destruction using the command `/stalker grief`.
Normally, it passes 9 blocks in front of you. A "targeted rush" (level 4+) heads straight for you; the word "RUN!" appears on the screen, signaling that you must dodge to the side.
This begins to occur automatically from level 2 onwards.

Lethal Jumpscare: If caught, you now die in a single hit. You are safe in Creative mode, and a Totem of Undying will save you once. The command `/stalker lethal` reverts this behavior to the original state (leaving you with 1 heart of health).

10 Mechanics That Define the Mod:

Rule of the Night: Each night, the Stalker sets a rule (e.g., do not run, do not look at the sky, do not stand still, do not crouch). Breaking it causes a Stalker to spawn and hunt you.
Crimson Night: Every 5th night, a storm arrives, accompanied by frequent rushes.
Item Thief: The Stalker takes an item from your inventory and drops it somewhere else. The item will glow, ensuring it doesn't get lost.
Chill: When the Stalker is nearby, a freezing blue tint appears on your screen.
Companion: Having another player or a pet nearby reduces the level of fear.
Anomaly: Flowers turn into "pale roses," and a carved pumpkin facing toward you may appear in the distance. Echo: After breaking a block, the same sound plays from behind you.
Torch Shield: If you hold a torch or lantern and face a creature while it’s chasing you, it will flee—but the item will be consumed. This does not work on Rush.
Insomnia: If you go 3 days without sleeping, your fear level increases and you begin to experience hallucinations.
Blood Debt: If you kill 8 animals or villagers, the Stalker will target you for a direct attack.