Monster Spawner

Monster Spawner
Blast Resistance	25
Fireproof	Yes
Drop Rate	33% by normal explosion 65% by lucky explosion 100% by pickaxe (Silk Touch)

Monster Spawner or simply a Spawner is a block that spawns mobs (or monsters). Mobs from spawners are a means to grind player XP by killing. They are also the primary method to grind money overnight by setting up automated death traps. Spawner mobs come in varying XP drops, drop rates, sell prices, and health.

Monster Spawners are the primary source of value in a value-based /f top map.

Behavior

A spawner is active when there is at least 1 player viewing the chunk (i.e., activation is based on render distance). This equates to 5 chunks (80 blocks horizontally, ∞ blocks vertically). Mobs from spawners stack within the chunk based on type. This means there can only be 1 stack of Cow, 1 stack of Zombie, 1 stack of Blaze, etc. in a chunk. A spawner will spawn a mob only within the same chunk that it is placed in, and always 0–3 blocks above the spawner. More spawners lead to higher rate of replenishment (i.e., larger stack sizes).

Right-clicking a spawner block while holding a spawner in hand (of the same type) increases the stack size of the placed spawner by +1. Multiple spawners can be stacked within the same block, up to 40x spawners within the same block. Stacked spawners function the same way as individual spawners, meaning a stack of 5x spawners is no different than having 5 separate spawners placed within the same chunk.

Once placed, a spawner block can be mined using a Silk Touch enchanted pickaxe. A spawner is free to mine for the next 5 minutes. After this grace period, there is a fine of 10% the spawner valuation. If the spawner is stacked, this fine is appropriately multiplied.

Stacking

A stack of 28,935x Enderman depletes while another Enderman takes its place.

Mob stacking is a behavior that reduces frames-per-second (FPS) and server performance by limiting the number of mobs in a chunk in a way that does not hinder the functional output from having otherwise individual mobs. When a spawner mob is killed, its stack size depletes by 1 and another mob (of the same type) is spawned at its location. If the damage dealt exceeds the maximum health of the mob, the remainder of the damage is passed to the next mob stack. This makes it possible to deplete >1 stack in one hit. A mob from spawner will stack up to 32,767x (i.e., $2^{15}-1$), after which its stack size will cease to increase.

Stack size also determines persistence. A mob with a stack size ≥64 will not despawn on chunk reloads and server restarts. A mob with a stack size of 1 will cease to take fire damage (or water damage in case of nether mobs). In a claimed territory, a member of the faction may run /smite to forcefully despawn a stack of mobs. This will not result in any loot drops or XP gains.

Properties

Spawner mobs are largely immobile, meaning they will not respond to water currents and knockbacks. However, they may be transported from one location to another using a fishing rod. Spawner mobs will drop player XP only when inflicted by melee damage, but will always drop loot regardless of the source of inflicted damage.

Most spawners can be bought directly from /shop, but few spawners are obtainable only through a mystery monster spawner. A mystery spawner costs $3,000,000 in /shop and gives a random spawner. However, high-demand spawners are locked behind loot pools.

Spawner Mob Properties

Mob	Health	Value	Hitbox	XP	Loot
Bat	6HP HP	$3,000,000	0.50w x 0.90h	0 EXP
Blaze	20HP × 10 HP	$390,000	0.60w x 1.80h	13 EXP	Blaze Rod (1x) (50% chance)
Cave Spider	12HP × 6 HP	$90,000	0.70w x 0.50h	5 EXP	String (0–2x) Spider Eye (1x)
Chicken	4HP HP	$65,000	0.40w x 0.70h	1–3 EXP	Chicken (1x) Cooked Chicken (1x) Feather (0–2x)
Cow	10HP HP	$162,000	0.90w x 1.40h	1–3 EXP	Raw Beef (1–3x) Steak (1–3x) Leather (0–2x)
Creeper	20HP × 10 HP	$390,000	0.60w x 1.70h	5 EXP	Gunpowder (1–2x) (66% chance)
Enderman	40HP × 20 HP	$390,000	0.60w x 2.90h	5 EXP	Ender Pearl (1x) (50% chance)
Ghast	10HP HP	$5,000,000	2.00w x 2.00h	5 EXP	Emerald (1–3x)
Iron Golem	100HP × 50 HP	$2,000,000	1.05w x 2.17h	0 EXP	Iron Ingot (3–5x)
Magma Cube	20HP × 10 HP	$4,000,000	1.02w x 1.04h	20 EXP	Diamond (1–3x)
Mooshroom	55HP × 27.5 HP	$3,000,000	0.90w x 1.40h	1–3 EXP	Gold Ingot (1–3x)
Pig	10HP HP	$65,000	0.90w x 0.90h	1–3 EXP	Raw Porkchop (1–3x) Cooked Porkchop (1–3x)
Sheep	8HP HP	$95,000	0.90w x 1.30h	1–3 EXP	Raw Mutton (1–2x) Cooked Mutton (1–2x)
Skeleton	20HP × 10 HP	$115,000	0.60w x 1.99h	5 EXP	Bone (0–2x) Arrow (0–2x)
Slime	16HP × 8 HP	$1,300,000	1.02w x 1.02h	4 EXP	Slimeball (1–2x) (66% chance)
Snowman	4HP HP	$3,000,000	0.70w x 1.90h	0 EXP	Snowman Soul (1x) (5% chance)
Spider	16HP × 8 HP	$95,000	1.40w x 0.90h	5 EXP	String (0–2x) Spider Eye (1x)
Wolf	8HP HP	$95,000	0.60w x 0.85h	1–3 EXP
Zombie	20HP × 10 HP	$115,000	0.60w x 1.95h	5 EXP	Rotten Flesh (0–2x) Potato (1x) (10% chance) Iron Ingot (1x) (10% chance) Carrot (1x) (10% chance)
Zombie Pigman	20HP × 10 HP	$390,000	0.60w x 1.95h	5 EXP	Rotten Flesh (0–1x) Gold Nugget (0–1x) Gold Ingot (1x) (10% chance)

  Exclusive from mystery monster spawners

  Exclusive from events and other loot pools

Timeline

2024-12-12	Spawner: max block stack size has been increased to 40 (previously 10) Spawner: to make it easier to pickup dropped spawners, stack of spawners are dropped upon being broken (previously each spawner would drop individually instead as a stack)
2024-03-14	Fixed bug: Custom blocks and Mob Spawners broken underwater do not drop items in few situations
2021-03-09	Monster spawners can once again be placed in claims close to warzone. Monster spawners and fat buckets will no longer despawn in lava.
2020-07-31	Stackable Spawners: Stackable spawners will now give you the ability to house more spawners within a smaller area! Simply right click a spawner with a placed spawner of the same kind! You can stack up to 10 spawners. Snowman Spawner: Snowman Spawners are intended to be grinded just like IG's but there's a catch. Whilst they do boast a significantly higher payout they have a 5% pct chance to drop Snowman Souls. Each drop sells for $3600.