Null items are perhaps the most iconic of all Skyblock glitch items.

Nulls are made when an item is given a damage value it normally isn't supposed to have. When Minecraft detects the value of this item, it does not know what texture to pair with it, because the block/item is not supposed to exist. Whenever this happens, Minecraft is coded to apply the purple and black null texture to the block. You can tell what the block is with advanced tooltips, turned on with F3 + H.

However, there are a few ways to view the real texture of the block. The first way is to view the textures is to log on Minecraft version 1.13 or higher, where Mojang redid the IDs for the whole game and removed the damage value system; thus Hypixel displays the regular texture of null blocks.

Another way is to place it down. Most nulls can be picked up as nulls, but some can not, making this not the best method. To pick up placed null sponge and null dirt, one needs to use silk touch. To pick up placed null leaves, one need to use shears or silk touch on another tool. One can not pick up place null mushroom or snow.

You can also use the Nulls Reborn texture pack for 1.8.9; an early version of the pack can be downloaded at https://hypixel.net/threads/nulls-reborn-1-8-9-null-texture-pack.3682295/

**All known nulls in Skyblock**
Item	Damage Values	Method
Obsidian	1-15	Day/Night Saver Making a null obsidian generator
Steve Head	3	Breaking heads with water and picking them up Dropping any washed head Randomly obtained from the Mythological event
Map	-128-128, excluding 0	Opening maps and dropping them on the ground
Stone Brick	4 - 15	Day/night saver Stone platforms
Wooden Plank	6-9	Day/night saver
Fishing Rod	Possible values 1-63, most commonly 16	Fishing before 0.5
Boots	Possible values 1-64	Fishing before 0.5
Bow	96 (Possible values 1-383 but the only value existing in Skyblock is 96)	Fishing before 0.5
Sand	2-9	Day/night saver
Prismarine	3-9	Day/night saver
Cobblestone Wall	2-15	Day/night saver
Poppy	9-15	Day/night saver
Dandelion	1-15	Day/night saver
Stone	7-9	Day/night saver
Quartz	5-9	Day/night saver
Acacia Log	2 & 3	Day/night saver
Alpha Slab/Petrified Wooden Slab	2	Day/night saver
Dirt	3-9	Day/night saver
Dragon Head	5	A very complicated method
Wooden Slab	2	Day/night saver
Acacia Leaf	2 & 3	Day/night saver
Brown Mushroom	14, 15	Silk Touch
Red Mushroom	14, 15	Silk Touch
Haybale	1-3	Day/night saver
Sandstone	3-9	Day/night saver
Red Sandstone	3-9	Day/night saver
Sapling	6 & 7	Day/night saver
Anvil	3	Day/night saver
Sponge	2-9	Day/night saver
Red Sandstone Slab	1-9	Day/night saver Block Zapper (only dv 8)
Banner	Can be a WALL_BANNER or STANDING_BANNER, depending on if the banner was on a wall or the floor when picked up	Telekinesis on banners near release Glitched event stands on islands
Snow	1-7	Block Zapper

History

Nulls have been created in many different ways. Those include the day/night saver null method, using the obsidian null method, and fishing up damaged items.

Trivia

Value 14 was obtained using silk touch on a mushroom cap block of the corresponding color in the mushroom desert, and value 15 from a stem block of the corresponding color.

Null snow's damage value corresponds to how many layers it has. Value 1 has two layers, value 2 has three, and so on, ending with value 7 having eight layers.

Null obsidian and haybale are the only blocks that do not have a missing texture in 1.8