Note: This is NOT a wish list. I made all the ideas similar. They all make Minecraft a bit more challenging and most are Halloween/scary themed in some way.
Ghost - The ghost is a new mob. It looks a lot like the default character skin, Steve, but it is transparent and has a white tint. If you are on fast instead of fancy graphics, the ghost will not be see-through. Ghosts are passive mobs. They don't even run away when attacked. They instead make the spawn rate of monsters a lot higher in a 20 block radius. The spawn rate goes back to normal when killed. Ghosts can even make monsters in areas that are lit up. However, Ghosts can only actually spawn in darkness. Ghosts float slightly above the ground, but they cannot actually fly around. They are a bit more rare than an enderman is, but they spawn slightly more frequently in abandoned mineshafts. Ghosts have 20 health (10 hearts), just like the player. They rarely drop a soul when killed. Ghosts can spawn on Peaceful, but they do nothing on peaceful difficulty.
Nether Beetle - The nether beetle is not actually a beetle at all. It looks like a red endermite except with two small, black eyes. It is a parasite. Rarely, zombie pigmen have the parasite on them and that makes them attack the player. If the player attacks back, nearby zombie pigmen that don't have the parasite will attack the player. When a zombie pigmen that had the parasite on them is killed, a nether beetle spawns on the ground. It will try to find a new zombie pigman host and it does NOT attack the player by itself. A nether beetle has 4 health (2 hearts). They drop 0-1 dead nether beetles. Nether beetles cannot spawn on peaceful.
Rat - Rats are new mobs that spawn near cakes and chests that have food in them. Rats will eat food out of chests and consume cakes. One rat will only consume two pieces of food or one slice of cake at a time. After about 2 minutes, it can eat more. Rats are more likely to spawn where rats are already at. Rats are passive and will run away when attacked. Now, rats cannot spawn in a 20 block radius of a cat unless there are already rats in the area. Cats will kill rats without even being told to by their owner. Dogs will only kill rats if told to. Rats will run away from cats, just like creepers do. Rats have 4 health (2 hearts). They rarely drop a rat tail when killed. Rats cannot spawn on peaceful.
Firebright Creeper - This new species of creeper is only found in the nether. It is red and does not do any damage when it explodes. Instead, it gives blindness for 5 seconds to players within a 5 block radius. This is because its explosion gives off so much light, it temporarily blinds the player. However, it can explode as many times as it wants to without dying. To keep this from being super overpowered, it has a 2 second cool-down before it can explode again. Firebright creepers can spawn anywhere within the nether. They are about as common as an enderman is in the overworld, a little bit more common. They have 20 health (10 hearts). They drop 0-2 glowstone dust. They do come in a charged form, but you cannot find it without cheating. The charged firebright creeper is exactly like the normal firebright creeper, except it has no cool-down. The charged version could be useful for map makers. This mob does not spawn on peaceful difficulty.
Morpher - Morphers are horrible creatures that spawn rarely in the Overworld. They will shapeshift into any nearby creature and act like this creature. When a player gets close, they will attack them like a zombie would. However, they are the speed of a player sprinting when they attack. They spawn like normal monsters do, in darkness. Morphers have the same amount of health as the mob they shapeshift into. They cannot shapeshift into the Ender Dragon or Wither without using cheats. They rarely drop a morpher heart.
Rat Tail - Rat tails are a rare drop from rats. They can be brewed into an awkward potion to give you a potion of nausea.
Potion of Nausea - You create these potions by brewing a dead nether beetle into an awkward potion.
Dead Nether Beetle - Dead nether beetles are a new drop from nether beetles. They can be brewed into an awkward potion to give you a potion of nausea.
Soul - Souls are a rare drop from ghosts. 8 souls can be crafted with a gold ingot to give you a soul-infused gold ingot. This ingot is a dark blue color.
Soul-Infused Gold Ingot - The soul-infused gold ingot can be used to make soul-infused gold tools, weapons, and armor. However, this gear is unique. It acts exactly like normal gold gear, but it slowly regains durability over time. So you can get really good enchantments on this gear easier than on diamond gear and it will never break if you are careful.
Infused Tools, Weapons, and Armor - They work exactly like gold gear, but slowly regain durability over time.
Morpher Heart: Morpher hearts can be brewed into an awkward potion to create a potion of health boost.
Potion of Health Boost: You can create this potion by brewing a morpher heart into an awkward potion.
Zombie Pigman Head - Zombie pigmen now rarely drop their head. They drop their head as rarely as a wither skeleton drops its skull. Their head can be placed like a normal head or worn as a helmet. When worn as a helmet, it makes nearby nether beetles come to you, thinking you'll be a good host. After 2 seconds, they'll realize you are a human and run away, looking for a new host.
Morph Block - The morph block gets the texture of the block to the right or left of it, it chooses a random side. It is crafted with 8 gold ingots around 1 morpher heart. You get 16 morph blocks. This can be useful if you ran out of some material you are using to build your house but have some gold ingots and morpher hearts.
Block of Soul-Infused Gold - A blue gold block. Made with 9 soul-infused gold ingots, like a normal ore block. It has a shimmering effect too, similar to the enchantment effect on a sword, pickaxe, etc.
Infused Anvil: Made like a normal anvil, except with soul-infused gold blocks where you'd put iron blocks and soul-infused gold ingots where you'd put iron ingots. This anvil does break like a normal anvil, but it will slowly fix itself if you don't use it for a while. It looks like a normal anvil, except blue.
Nausea - Nausea now makes mobs sometimes not notice cliffs and makes them turn slower when they chase you. This is so there is a reason to make potions of nausea in both singleplayer and multiplayer.
Jockeys - There is now a new jockey that can spawn. This is the creeper jockey. It is a skeleton riding a creeper.
Tree Growth - When you grow a tree, it has a 15% chance to grow into a dead tree. Dead trees look like the large oak trees but without any leaves. The tree is also made out of the wood that corresponds to the sapling you planted.
Rust - Iron and chainmail armor loses 10 durability every 5 seconds you're in water, because it rusts. This gives you a reason to choose to get leather armor instead of iron armor at the start of the game.
Hungry Zombies - The virus of the undead spreads! Zombies will now devour pigs, cows, chickens, sheep, and rabbits! They will not kill killer rabbits and they will not turn animals into undead creatures.
Make sure to leave feedback! Feel free to ask any questions you may have or to leave any suggestions you have!
That could work for a Special Halloween Season Event.
I personally feel this would be better in a mod, but they're good ideas in general, just not very vanilla-ish.
Rollback Post to RevisionRollBack
My avatar is a spectral archmage exiled from his native realm for practicing light magic, as most Undead use blood magic to gain immortality and fear the light. Due to this he hates his own kind and, save for the Rebellion of Light, generally kills the Undead on sight. Skilled in water and light magic, syringe guns and frying pans. Peaceful unless threatened. My dolphin is also spectral and his name is Bob