Catacombs
| Catacombs | |
|---|---|
| Mod | Iron's Spells 'n Spellbooks |
| Dimension | Overworld |
| Spacing | 50 chunks, separation 33 (mod default ~71, ×0.707 pack spread factor) |
| Observed | 4 per 26 km² |
| Typical size | 160×68×181 |
| Biomes | 198 |
| Horror structure | Yes |
| Loot tables | 11 |
| ID | irons_spellbooks:catacombs |
Catacombs are underground ruins added by Iron's Spells 'n Spellbooks. Each is a buried network of hallways and rooms, with a throne room at its core, populated by undead monsters and a Necromancer. The structure is one of the horror structures in Fear Nightfall that a player will meet often, and its chests are a major source of Arcane Essence, Scrolls and Dead King materials.
Generation
Catacombs generate in the Overworld. Their biome tag allows generation in 198 biomes in this pack, including forests, plains, taiga, jungle, savanna, desert, snowy and highland biomes. The structure is also one of the structures that a Wayward Compass can locate.
Placement uses the spacing and separation values in the placement table below. These values are the in-game values, already scaled by the pack's Sparse Structures factor. Catacombs use a spacing of 50 chunks and a separation of 33, and about four are found per 26 km² in testing.
The structure is placed at the underground_decoration step, before ores and plants. Its start point is chosen between Y -40 and Y 20. The bury terrain adaptation then sinks the structure below the surface, so a player usually finds an entrance in a hillside, cave or hole rather than seeing a building. Pieces are limited to 96 blocks from the start point, and the jigsaw tree is 7 pieces deep.
Fear Nightfall changes the structure set. Catacombs are one of the horror structures the pack places about 30% closer together than before. Where they share a structure set with other structures, they are given 6× weight.
Layout
The structure is assembled from 36 template pieces in a jigsaw tree. The start piece is the origin, which is placed rigidly and buried. Other pieces come from these pools:
- Hallways: corridors that connect rooms.
- Room halves and rooms or hallways: rooms that attach to one side of a corridor, or that can be replaced by a corridor.
- Throne room: a large chamber with a vault and armor stands. The vault holds the structure's best loot.
- Fallback: pieces used to end a branch when the jigsaw tree reaches its depth limit.
Walls and corridors are dark, and most rooms have few light sources. Monsters can appear at close range in narrow corridors.
Inhabitants
The structure overrides the monsters that spawn inside each of its pieces. Each entry is limited to one mob per group:
| Entity | Weight | Notes |
|---|---|---|
| Catacombs Zombie | 10 | The most common monster in the structure. |
| Skeleton | 5 | Vanilla skeletons. |
| Necromancer | 2 | A spellcasting monster and the rarest of the three. |
The Catacombs Zombie is a zombie with a custom equipment roll. Each armor slot is empty 40% of the time. Otherwise the piece is leather, chainmail or iron, and the roll favors iron when the roll is high. Its armor is never dropped, so killing one does not yield armor. About one in five Catacombs Zombies gains one of four permanent effects: invisibility, Speed II, Resistance II or Strength I. About 1% wear a cyan banner on the head.
The Necromancer is a spellcasting monster that also spawns naturally in every Overworld biome. Inside Catacombs it appears alongside the zombies and skeletons above.
The structure templates also place a Dead King Corpse and a Spectral Hammer entity. The corpse is part of the Dead King mechanics.
Loot
Each chest type draws from its own loot table. The most valuable are these:
- Dead King vault: the best loot in the structure. Its chest always holds a Blood Vial and a Dead King Phylactery Shard, and it often holds Legendary Ink, a Golden Apple, Epic Ink and Diamonds.
- Coffin: always holds Arcane Essence and a Scroll. Bones, cobwebs, gold ingots, iron gear and diamonds are common.
- Magic bookshelf: always holds Arcane Essence. Enchanted Books and Uncommon Ink are common. Ancient Knowledge Fragments and Epic Ink are uncommon. A Heavy Chain or an Amulet of Teleportation is very rare.
- Generic magic treasure: always holds Arcane Essence and a Scroll. Iron, copper and gold ingots and Uncommon Ink are common.
- Component storage: the chest most likely to hold a Shriving Stone, Arcane Essence or Blood Vial.
- Hidden trough: a chest with wheat, hay bales and emeralds, which also has a 43% chance of a Diamond.
The generated loot tables below list every chest and their drop chances.
Biomes (198): Ominous Woods, Plains, Sleepy Hollows, Forest, Brushland, Highlands, Dark Forest, Yellowstone, Clover Plains, Blackwood Taiga, Savanna, Arid Highlands, Coniferous Forest, Taiga, Wasteland, Prairie, Forested Highlands, Maple Forest, Snowy Plains, Shield, Jungle, Prairie, Alpine Highlands, Dry Bushland, Desert, Mystic Grove, Redwood Forest, Orchard, Mediterranean Forest, Seasonal Forest, Lavender Field, Hot Shrubland, Pine Taiga, Boreal Taiga, Shrubland, Temperate Highlands, Rainforest, Scrubland, Maple Woods, Steppe, Overgrown Greens, Old Growth Birch Forest, Field, Rainforest, Joshua Desert, Saguaro Desert, Sparse Jungle, Snowy Taiga, Snowy Badlands, Shrubland, Lush Desert, Volcanic Plains, Cold Desert, Muskeg, Jacaranda Glade, Tundra, Aspen Glade, Birch Forest, Cold Shrubland, Sparse Rainforest, Bayou, Silver Birch Forest, Cold Boreal Taiga, Shrubland, Rocky Mountains, Fir Clearing, Old Growth Pine Taiga, Tundra, Frozen Pine Taiga, Old Growth Forest, Grove, Autumnal Maple Forest, Stony Shore, Grassland, Snowy Coniferous Forest, Fungal Jungle, Willow Forest, Dryland, Savanna Badlands, Rocky Jungle and 118 more
Mobs placed in the structure: Catacombs Zombie, Skeleton, Necromancer, Spectral Hammer, Chicken, Skeleton
Chest loot: irons_spellbooks:chests/bookshelf_loot
| Item | Chance | Avg. stack |
|---|---|---|
 Paper | 93.7% | 7.4 |
 Book | 55.0% | 1.8 |
 Common Ink | 52.7% | 2.5 |
 Enchanted Book | 40.3% | 1.0 |
 Uncommon Ink | 34.3% | 1.3 |
 Arcane Essence | 17.0% | 2.1 |
 Book and Quill | 16.0% | 1.0 |
 Scroll | 8.7% | 1.0 |
 Rare Ink | 3.0% | 1.0 |
Chest loot: irons_spellbooks:chests/catacombs/coffin_loot
| Item | Chance | Avg. stack |
|---|---|---|
| Arcane Essence | 100.0% | 10.6 |
| Scroll | 100.0% | 1.5 |
 Bone | 87.7% | 7.9 |
 Cobweb | 86.3% | 1.9 |
 Gold Ingot | 65.7% | 5.2 |
 Iron Sword | 33.7% | 1.1 |
 Diamond | 30.0% | 1.1 |
 Emerald | 27.0% | 2.4 |
 Rotten Spell Book | 17.0% | 1.0 |
 Iron Leggings | 12.7% | 1.1 |
 Iron Helmet | 12.3% | 1.1 |
 Diamond Boots | 10.7% | 1.1 |
 Iron Boots | 10.7% | 1.0 |
 Diamond Leggings | 9.3% | 1.0 |
 Diamond Chestplate | 9.0% | 1.0 |
 Diamond Sword | 8.3% | 1.1 |
 Diamond Helmet | 7.3% | 1.0 |
 Iron Chestplate | 6.7% | 1.0 |
Chest loot: irons_spellbooks:chests/catacombs/dead_king_vault
| Item | Chance | Avg. stack |
|---|---|---|
 Blood Vial | 100.0% | 5.0 |
 Dead King Phylactery Shard | 100.0% | 2.0 |
 Blank Runestone | 75.7% | 1.3 |
 Legendary Ink | 75.3% | 1.6 |
| Scroll | 74.7% | 1.3 |
 Golden Apple | 74.7% | 1.0 |
 Epic Ink | 73.0% | 1.5 |
| Rare Ink | 58.3% | 1.3 |
| Diamond | 52.0% | 1.2 |
| Gold Ingot | 50.7% | 4.6 |
 Ancient Knowledge Fragment | 50.3% | 1.0 |
 Arcane Cloth | 47.7% | 1.8 |
| Emerald | 47.7% | 4.3 |
 Arcane Ingot | 44.7% | 1.9 |
 Enchanted Golden Apple | 25.3% | 1.0 |
 Ring of Recovery | 3.3% | 1.0 |
 Conjurer's Talisman | 3.0% | 1.0 |
 Heavy Chain | 3.0% | 1.0 |
 Fireward Ring | 2.3% | 1.0 |
 Poisonward Ring | 2.3% | 1.0 |
 Amulet of Teleportation | 2.3% | 1.0 |
 Frostward Ring | 2.0% | 1.0 |
 Silver Ring | 2.0% | 1.0 |
 Ring of Expediency | 1.7% | 1.0 |
 Amulet of Concentration | 1.7% | 1.0 |
 Emerald Stoneplate Ring | 1.7% | 1.0 |
 Air | 1.7% | 0.0 |
 Ring of Invisibility | 1.0% | 1.0 |
Chest loot: irons_spellbooks:chests/catacombs/hidden_trough_treasure
| Item | Chance | Avg. stack |
|---|---|---|
 Wheat | 100.0% | 25.1 |
| Emerald | 99.3% | 6.3 |
 Hay Bale | 87.0% | 2.3 |
| Scroll | 69.7% | 1.0 |
| Diamond | 43.0% | 1.2 |
| Blank Runestone | 30.3% | 1.0 |
| Rotten Spell Book | 5.3% | 1.0 |
Chest loot: irons_spellbooks:chests/catacombs/pot
| Item | Chance | Avg. stack |
|---|---|---|
| Bone | 17.0% | 2.1 |
| Cobweb | 15.3% | 1.6 |
| Emerald | 12.7% | 3.1 |
| Arcane Essence | 9.0% | 4.5 |
| Diamond | 4.7% | 1.0 |
 Music Disc | 4.0% | 1.0 |
 Skeleton Skull | 2.3% | 1.0 |
Chest loot: irons_spellbooks:chests/catacombs/wall_loot
| Item | Chance | Avg. stack |
|---|---|---|
| Cobweb | 39.7% | 2.7 |
| Skeleton Skull | 36.3% | 1.0 |
 Rotten Flesh | 35.3% | 4.9 |
| Bone | 34.7% | 3.8 |
 Chain | 21.0% | 2.9 |
| Emerald | 20.7% | 2.3 |
| Arcane Essence | 20.3% | 2.5 |
 Iron Ingot | 17.3% | 2.7 |
| Diamond | 16.0% | 1.0 |
| Blank Runestone | 14.0% | 1.0 |
| Iron Sword | 12.3% | 1.0 |
| Scroll | 7.7% | 1.0 |
| Ancient Knowledge Fragment | 6.7% | 1.0 |
| Iron Leggings | 5.7% | 1.0 |
| Air | 4.3% | 0.0 |
 Chainmail Helmet | 3.3% | 1.0 |
| Iron Boots | 3.3% | 1.0 |
| Rotten Spell Book | 3.0% | 1.0 |
 Chainmail Chestplate | 2.3% | 1.0 |
| Ring of Expediency | 1.0% | 1.0 |
| Conjurer's Talisman | 1.0% | 1.0 |
| Frostward Ring | 1.0% | 1.0 |
| Ring of Invisibility | 1.0% | 1.0 |
| Poisonward Ring | 1.0% | 1.0 |
| Amulet of Concentration | 0.7% | 1.0 |
| Fireward Ring | 0.7% | 1.0 |
| Heavy Chain | 0.7% | 1.0 |
| Amulet of Teleportation | 0.7% | 1.0 |
| Diamond Sword | 0.7% | 1.0 |
| Silver Ring | 0.3% | 1.0 |
Chest loot: irons_spellbooks:chests/component_storage
| Item | Chance | Avg. stack |
|---|---|---|
 Shriving Stone | 41.3% | 1.2 |
| Arcane Essence | 34.0% | 1.9 |
| Emerald | 25.7% | 3.4 |
 Poisonous Potato | 24.0% | 3.6 |
| Blood Vial | 22.3% | 3.2 |
 Ender Pearl | 21.7% | 2.9 |
 Divine Pearl | 21.3% | 3.3 |
 Frozen Bone | 20.0% | 3.4 |
 Bottle o' Lightning | 18.7% | 3.0 |
Chest loot: irons_spellbooks:chests/filler_storage_loot
| Item | Chance | Avg. stack |
|---|---|---|
| Cobweb | 81.7% | 1.6 |
| Rotten Flesh | 54.7% | 1.3 |
 Charcoal | 36.0% | 1.1 |
| Arcane Essence | 28.3% | 2.5 |
 Apple | 27.3% | 1.1 |
| Book | 25.3% | 1.1 |
| Common Ink | 18.7% | 1.0 |
| Emerald | 14.3% | 1.1 |
| Air | 7.0% | 0.0 |
| Uncommon Ink | 3.7% | 1.0 |
| Blank Runestone | 0.7% | 1.0 |
| Rare Ink | 0.7% | 1.0 |
| Scroll | 0.7% | 1.0 |
Chest loot: irons_spellbooks:chests/generic_magic_treasure
| Item | Chance | Avg. stack |
|---|---|---|
| Arcane Essence | 100.0% | 8.0 |
| Scroll | 100.0% | 1.5 |
| Iron Ingot | 95.0% | 6.4 |
 Copper Ingot | 87.0% | 2.0 |
| Uncommon Ink | 78.7% | 1.7 |
| Common Ink | 70.7% | 1.5 |
| Gold Ingot | 67.7% | 3.0 |
| Emerald | 61.7% | 2.6 |
| Blank Runestone | 23.7% | 1.0 |
| Ender Pearl | 22.3% | 1.5 |
| Poisonous Potato | 21.0% | 1.6 |
| Blood Vial | 20.3% | 1.6 |
| Frozen Bone | 19.7% | 1.6 |
| Divine Pearl | 19.3% | 1.4 |
| Bottle o' Lightning | 18.7% | 1.7 |
| Diamond | 18.0% | 1.0 |
| Rare Ink | 10.3% | 1.1 |
| Iron Chestplate | 7.0% | 1.0 |
| Iron Boots | 5.7% | 1.0 |
| Iron Leggings | 5.7% | 1.0 |
| Iron Sword | 5.7% | 1.0 |
| Epic Ink | 4.7% | 1.0 |
| Iron Helmet | 3.7% | 1.0 |
| Poisonward Ring | 3.3% | 1.0 |
| Diamond Sword | 3.3% | 1.0 |
| Diamond Chestplate | 2.7% | 1.0 |
| Silver Ring | 2.3% | 1.0 |
| Diamond Boots | 2.3% | 1.0 |
| Diamond Helmet | 2.3% | 1.0 |
| Ring of Expediency | 1.7% | 1.0 |
| Emerald Stoneplate Ring | 1.7% | 1.0 |
| Amulet of Teleportation | 1.7% | 1.0 |
| Air | 1.7% | 0.0 |
| Diamond Leggings | 1.7% | 1.0 |
| Conjurer's Talisman | 1.0% | 1.0 |
| Heavy Chain | 1.0% | 1.0 |
| Ring of Invisibility | 1.0% | 1.0 |
| Amulet of Concentration | 0.7% | 1.0 |
| Ring of Recovery | 0.7% | 1.0 |
| Fireward Ring | 0.7% | 1.0 |
Chest loot: irons_spellbooks:chests/magic_bookshelf_loot
| Item | Chance | Avg. stack |
|---|---|---|
| Arcane Essence | 100.0% | 5.3 |
| Paper | 95.3% | 7.6 |
| Uncommon Ink | 82.7% | 2.0 |
| Enchanted Book | 72.7% | 1.8 |
| Common Ink | 72.0% | 1.7 |
| Book | 54.3% | 1.9 |
| Scroll | 25.7% | 1.1 |
| Rare Ink | 10.3% | 1.0 |
| Ancient Knowledge Fragment | 5.3% | 1.6 |
| Epic Ink | 5.0% | 1.0 |
| Heavy Chain | 1.3% | 1.0 |
| Amulet of Teleportation | 1.0% | 1.0 |
| Ring of Recovery | 0.7% | 1.0 |
| Emerald Stoneplate Ring | 0.7% | 1.0 |
| Poisonward Ring | 0.7% | 1.0 |
| Ring of Expediency | 0.3% | 1.0 |
| Amulet of Concentration | 0.3% | 1.0 |
| Conjurer's Talisman | 0.3% | 1.0 |
| Fireward Ring | 0.3% | 1.0 |
| Silver Ring | 0.3% | 1.0 |
| Air | 0.3% | 0.0 |
Chest loot: irons_spellbooks:chests/wheat
| Item | Chance | Avg. stack |
|---|---|---|
| Wheat | 100.0% | 25.1 |
| Hay Bale | 86.0% | 2.2 |
 Pumpkin | 24.7% | 1.0 |
Tips
Bring a light source and food, and carry spare blocks to light dark corridors. Most fights happen in corridors, so clear the zombies and skeletons from a corridor before opening its chests. The Catacombs Zombie's invisibility effect can make it hard to see from a distance.
Go to the throne room only after you have the health and mana to survive a fight there. The Dead King vault is the main reason to enter the structure. The Dead King Phylactery Shard is guaranteed from the vault, so the vault is worth clearing before a boss fight.
The hidden Enter Catacombs advancement fires when a player first enters the structure. It requires the Wayward Compass advancement first.