Java Edition 15w44b

15w44b was released to make various items available in survival and to fix bugs and crashes.

Additions

 * Attributes
 * , ranging from -1024 to 1024.
 * Used when processing loot tables along with the  tag. Currently used for opening chests and chest minecarts, fishing, and player-killed mob drops.
 * Status effects
 * New status effects: Luck and Bad Luck
 * Increases/Decreases the luck attribute by ±1 per level.
 * Uncraftable Potion
 * Has no effect
 * Cannot be obtained in survival
 * Luck potion
 * Gives the Luck effect for 5 minutes
 * Also comes in splash and lingering potion forms as well as for tipped arrows ("Arrow of Luck").
 * Tipped Arrows
 * Now exist for empty bottles, water bottles, mundane potions, thick potions and awkward potions

Changes

 * Fishing
 * Luck of the Sea and the new Luck effect affect fishing again, and effects stack. Each point increases the weight of treasure by 2, decreases the weight of fish by 1, and decreases the weight of junk by 2.
 * End Crystal
 * Can now be crafted using an ender eye in the middle, a ghast tear on the bottom and 7 glass blocks on the remaining squares.
 * Are no longer dropped by undead horses.
 * End Rod
 * Can now be crafted using a popped chorus fruit in the bottom and a blaze rod on top.
 * Yields 4 per craft
 * Tipped Arrow
 * Can now be obtained in survival
 * Splashing down a lingering potion first, then shooting regular arrows through that cloud will give you a tipped arrow back.
 * This way you can get a max of 5 arrows per lingering potion (15 per dragon's breath).
 * For effects with duration, the duration is $1/8$ that of the corresponding potion.
 * Hay Bale
 * Falling onto a hay bale does only 20% of normal fall damage.
 * Guardians
 * Player kills now no longer drop fishing junk or fishing treasure, only fish.
 * This does not include elder guardians.
 * Horses
 * Horses, donkeys, and mules drop 0–2 leather, affected by Looting, which is a return to pre-15w43a behavior.
 * Skeleton and zombie horses no longer drop end crystals; they again drop 1 bone or 1 rotten flesh, respectively.


 * Entities
 * TippedArrow has been removed. Arrow is used instead.


 * NBT tags
 * Entity: Arrow
 * (string): Potion effect of the arrow
 * e.g.
 * (list): List of custom potion effects.
 * e.g.
 * Entity: AreaEffectCloud
 * (string): Potion effect of the AreaEffectCloud
 * e.g.