Java Edition guides/1.3 releases

This guide is a simplified overview of all the changes in the 1.3.x releases, which assumes at least some familiarity with the Java Edition 1.2.x releases.
== Mobs ==
=== Changed ===
All mobs 		
* Mobs can now spawn on top of all upside down slabs and stairs
Pigs 		
* Drop 1–3 porkchops instead of 0–2.
Silverfish		
* Will now spawn more silverfish from nearby silverfish blocks more often, when suffering from poison potions.
Creepers 		
* Now have increased knockback effect.
* Now do more or less damage depending on difficulty:
** Easy: ~50% less damage
** Normal: same damage as before
** Hard: 33 1⁄3% more damage.
Endermen 		
* Now stop in front of the player. 
* Now teleports behind the player when the player swings their sword.
Villagers 		
* Will now get a random profession when spawned from spawn eggs.
 
== Blocks ==
=== New ===
Emerald Ore 		
* Generates in Extreme hills.	
* Pickaxe (Iron or better)	
* Drops Emerald, which can be used for villager trading or crafted into a block of emerald.
Block of Emerald 			
* Pickaxe (Iron or better)	
* Can be used as a decorative block.
Ender Chest 			
* Pickaxe
** Drops itself when mined with a tool enchanted with Silk Touch, otherwise drops eight obsidian.	
* Can store items per player, and which contents can be accessed from anywhere in all dimensions.
Tripwire Hook 			
* Any	
* Can be used with tripwires to activate redstone.
Tripwire 		
*Obtained from killing Spiders and breaking Cobwebs, and generates naturally in jungle temples.	
* Any	
* The block form of String.
* Used to activate tripwire hooks.
Cocoa Pod 		
*Generates naturally on Jungle trees, and created by placing cocoa beans on jungle logs.	
* Any	
* The block form of Cocoa Beans.
* When fully grown, drops additional cocoa beans when broken.
Sandstone Stairs 			
* Pickaxe	
* Can be used as a decorative block.
Spruce, Birch and Jungle Stairs and Slabs			
* Axe	Decorative building blocks.
Wood 		
* Only obtainable by third party programs.	
* Axe	
* Can be used as a decorative block.
=== Changed ===
Wooden slabs, and Wooden stairs		
* Added all wood types.
** Wooden slabs crafted after the update act like wood.
** Adjusted hitbox.
Wooden pressure plates 		
* Can be triggered by arrows.
Log 		
* Can now be placed in 3 different directions.
** Placement works similar to piston placement.
Furnaces 		
* Can now be fueled by wooden tools.
* Now return an empty bucket when using lava buckets as fuel.
Ice 		
* Now disappears instead of melting when placed in the Nether, regardless of light.
* Can now be obtained using Silk Touch-enchanted tools.
Glass panes 		
* Can now be obtained using Silk Touch-enchanted tools.
Dispenser 		
* Minecarts & boats will now be placed if there's rails/water in place respectively.
* Will now suck in or place water or lava in front of them instead of dispensing buckets.
Gravel 		
* Changed texture
Levers 		
* Can be placed on the underside of blocks.
Pistons 		
* Now take 2 redstone ticks (4 game ticks) to extend.
TNT 		
* Now does different amounts of damage depending on difficulty:
** Peaceful: no damage
** Easy: ½ less damage
** Normal: same damage as before
** Hard: ⅓ more damage.
Nether wart 		
* Can now be grown in the Overworld and in the End.
Signs 		
* Now stack up to 16.
* Crafting now gives 3 signs instead of 1.
Monster spawners 		
* Added NBT tags to further customize spawned mobs.
** Only changeable using map editors or mods.
Doors 		
* Now show their damage when being broken by zombies.
All Slabs & stairs 		
* Will now be placed upside-down when placed against the upper half of a block's side.
** When placed upside down, rails, pressure plates, levers, doors, torches, redstone torches, repeaters, redstone dust and beds can be placed on them - Redstone dust behaves like on glowstone - It transmits power horizontally and upwards, but not downwards. Redstone torches don't power redstone placed on slabs/stairs above them.
== Items ==
=== New ===
Emerald 		
* Can be obtained by mining Emerald Ore	
* Is used to trade with villagers
Book and quill			
* Right-click to read or write in and edit up to 50 pages.
* Clicking 'Done' saves the text edited into the book
* Clicking 'Sign' chooses a title to finalize the book
== Structures ==
=== New ===
Desert village		Generates in deserts	Can generate blacksmith buildings with 1 chest.	Villagers	
*Desert village variant made from sandstone instead of cobblestone and wood.
Desert pyramid		Generates in deserts	4 chests 	None 	
* Built out of various kinds of sandstone and wool.
* Includes hidden chest room and TNT trap, with loot including rotten flesh, bones, iron ingots and gold ingots, diamonds and emeralds.
Jungle pyramid		Generates in jungles	2 chests 	None 	
* Built out of various kinds of cobblestone.
* Contains multiple tripwire traps triggering dispensers filled with arrows.
* Loot chests include bones, rotten flesh, gold ingots, iron ingots, diamonds and emeralds.
== World types ==
=== New ===
Large Biomes		
* Generate as default worlds, but 16× bigger
* Beaches look closely to what they looked like in Java Edition Beta 1.7.3 and prior.	Same, as in normal world.
ja:ガイド/Java Edition/1.3 リリース
ru:Руководства по Java Edition/Полные выпуски 1.3
zh:Java版指南/1.3版本