The Stuff, (from the movie simply titled "The Stuff"), is a seemingly harmless material that was turned into a dessert. Now, It spreads its influence throughout your world and your only option is to survive.
--NEW UPDATE: THE NERF UPDATE.
This update aims to make the stuff infection a bit more fair to the player and other infections. You can now truly fight back, but dont be fooled. Its still very good at spreading fast if kept unchecked.
NOTE: This is probably by far the strongest infection mod ive ever tested, but only really against other infection mods. Its perfect prey are those dumb loud and bad looking infection mobs that deal like 80 damage and have 500 health, so if you ever wanted to get payback, this mod is for you.
Q: How does it enter my world?
A: About once every 10 minutes (on average), a single stuff block will fall from the sky. You will be notified. Note that you must be in either survival or adventure mode for this to happen. If you dont want to wait, you can spawn it in via creative mode. It also can spawn as rare infected mobs deep underground.
Q: Is there any way to stop it?
A: Yes. By constructing UV flashlights and lamps, you can surround your base and arm yourself with UV light, their weakness. Despite this, they are quite expensive and you may have to defend with traditional methods for a while. Iron/snow golems are very good at handling the masses.
BLOCKS
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Stuff Block: After a short amount of time, a few Stuff blobs will burst from the block, leaving 0 - 3 depleted stuff blocks on the ground.
Depleted stuff block: Important resource for making UV dust, an important ingredient for UV lights.
UV Lamp: Upon having redstone activation, it will instantly kill any nearby stuff blobs. It takes longer for Seethers.
Stuff Bricks: Makes a quiet but constant sound whilst a mob walks on it, also slows and adds slipperyness. Useful for trenches or defense barriers. Also makes any falling blocks drop upon landing on them, allowing you to stuff-proof the roof of your base. (This specific feature may be up to change in the future)
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ITEMS
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UV flashlight: A portable version of the UV Lamp with only 20 uses and a slightly shorter range, along with a cooldown.
UV dust: Created from nether quartz, glowstone dust, and depleted stuff, it is an essential ingredient in UV lights. Also obtainable from killing Seethers.
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MOB(s)
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Stuff Blob: A small blob of the stuff, will attempt to infect any other mob. Upon being infected, you get the "Stuffed" effect. You will take constant damage and minor slowness. If you or any other mob/player get below 1/3rd of your health, you will explode into stuff blocks sent out in all directions. the stronger the mob, the more stuff is produced. This means weak mobs like pigs will create little and iron golems will create lots. Whilst being infected, some non player mobs will run towards the nearest entity whilst infected, also called the "trance" state.
The Seether: A fake creeper. Can be made one of two ways: a 1/10 chance when a stuff blob should spawn, or a 1/3 chance when a creeper is supposed to die from the infection. It will wander around aimlessly, but if it sees anything nearby it will run at it with alarming speed and explode, releasing more stuff. Its texture is ever so slightly different from a normal creepers, so keep your eyes peeled.
NOTE: If a mob has below 5 max HP, they will be killed and only a stuff blob will emerge from it. This is an upgrade from the previous system where the stuff could be very easily killed off by making them infect super weak units like chickens and not reproduce in the process. Now, its 1:1, so no real benefit.