Toxic Lair

Toxic Lair is an underground horror structure added by Dungeons and Taverns. It is a large, decayed lair built from a central entrance and a set of outside houses, underground rooms and spawner rooms. It is populated with spiders, zombies, skeletons, slimes and witches, and its deepest rooms hold boss spawners and a reward vault. Players care about it because it has a dedicated boss encounter, two lair-specific keys, and a boss vault with enchanted books, storage blocks and froglights. Fear Nightfall counts it among its horror structures.

Generation

The structure generates in the Overworld, in the swamp biome collection (#nova_structures:collections/swamps). Biomes that qualify include Swamp, Mangrove Swamp, Willow Swamp, Bayou, Marsh, Fen, Wetland, Bog, Floodplain and Fungal Fen. It is placed in the underground_decoration generation step, so its rooms are built into the terrain. The lair's entrance anchor sits at a fixed height of Y 67.

Placement uses a random-spread set with a spacing of 84 chunks and a separation of 21 chunks. The lair is one of four structures in the nova_structures:swamp_structure set. It has a weight of 1 out of a set total of 4. The spacing is already scaled by the pack's sparse-structure factor. In a 26 km² survey of swamp terrain, no lair was observed, so it should be treated as rare. As a horror structure, it is subject to the pack's horror placement changes, and horror structures concentrate in humid, temperate-to-cool forests and swamps rather than in deserts, jungles or peaks.

Layout

The lair is built from a start pool that places the main entrance. A jigsaw of up to six levels (size 6) then connects the rest of the structure. The template pools include:

• Outside houses: the toxic_lair_outside_house_* templates, which make up the above-ground part of the lair.
• Ruins: a ruins pool of broken structures.
• Foundations: cobblestone, log and stone-brick foundation pieces that support the outside houses.
• Underground rooms: several variants, including a standard room, a room without a door, a decorated room, and a fallback room.
• Mob rooms: a pool that adds hostile mobs to the rooms (see the Inhabitants section below).
• Spawner rooms: rooms with a boss spawner and a vault. Each spawner room picks either a normal vault or an ominous vault, with the normal vault weighted twice as heavily as the ominous one.

The lair's blocks pass through the toxic_lair_degradation and toxic_lair_surface_degradation processors, which give the structure its decayed look. The structure scan found 145 templates in total.

Inhabitants

While a player is in the lair, the structure's monster spawn overrides spawn the following mobs. Each entry lists its relative weight and the group size used when it spawns.

The witch has the highest weight of any entry. Cave spiders and slimes come next. The template scan also found spiders, cave spiders, slimes, witches and zombies placed directly in the structure.

Spawner rooms hold a boss spawner. There are two boss variants, a slime boss and a spider boss, and each has an ominous version.

Loot

The lair's chests draw on several loot tables. The strongest loot is in the boss vault. It always contains a bow (100%). It also has a block of emerald, iron or gold (58–60%), an enchanted book (43%), an ominous bottle (57%), arcane essence (46%), a golden apple (28%), and froglights (27–32%).

The other chest tables are a generic chest, a brewing chest and a kitchen chest. The brewing chest is the source of splash potions (100%), scrolls, ancient knowledge fragments and ink. The generic chest holds moss blocks, emeralds, diamonds and iron ingots, along with a trial key (10%) and a smithing template (2%). The kitchen chest holds baked potatoes, onions and cooked fish.

Two lair-specific keys exist. The Toxic Key is a Trial Key renamed for the lair. The Toxic Boss Key is an Ominous Trial Key renamed for the boss room. The spider boss spawner's reward loot is the Toxic Boss Key.

The lair also has its own archaeology and pot loot tables (nova_structures:archaelogy/archeology_toxic and nova_structures:pots/pot_toxic). Completing the approach advancement, "Approach the toxic lair," is a child of the find-all-illager-structures advancement.

Biomes (12): Bayou, Floodplain, Mangrove Swamp, Bayou, Willow Swamp, Swamp, Marsh, Fen, Wetland, Bog, Marsh, Fungal Fen

Mobs placed in the structure: Cave Spider, Slime, Spider, Witch, Zombie

Chest loot: nova_structures:chests/toxic_lair/brewing

Item	Chance	Avg. stack
Splash Potion	100.0%	1.9
Air	94.3%	0.0
Potion	93.3%	1.6
Scroll	92.3%	2.1
Ancient Knowledge Fragment	79.3%	2.0
Uncommon Ink	77.0%	1.6
Common Ink	53.3%	1.4
Ominous Bottle	45.3%	1.1
Fermented Spider Eye	40.3%	1.7
Redstone Dust	34.0%	1.7
Arcane Essence	33.3%	8.2
Gunpowder	32.3%	2.2
Blank Runestone	31.0%	1.0
Rare Ink	29.3%	1.1
Cobweb	20.7%	1.5
Glowstone Dust	20.3%	1.5
Slime Block	19.7%	1.5
Epic Ink	18.0%	1.1
Stone	17.0%	1.7
Enchanted Book	5.7%	1.0
Frostward Ring	5.3%	1.0
Heavy Chain	5.0%	1.0
Silver Ring	5.0%	1.0
Ring of Expediency	4.7%	1.0
Ring of Invisibility	4.3%	1.0
Amulet of Concentration	3.7%	1.0
Fireward Ring	3.3%	1.0
Poisonward Ring	3.3%	1.0
Conjurer's Talisman	2.7%	1.0
Ring of Recovery	2.7%	1.0
Emerald Stoneplate Ring	2.3%	1.0
Amulet of Teleportation	2.0%	1.0

Chest loot: nova_structures:chests/toxic_lair/generic

Item	Chance	Avg. stack
Moss Block	49.0%	3.8
Apple	48.3%	3.9
Exposed Copper	47.3%	3.6
Emerald	29.7%	2.7
Diamond	27.3%	1.1
Iron Ingot	22.7%	1.9
Honey Bottle	20.7%	1.6
Gold Ingot	20.0%	2.9
Name Tag	11.0%	2.3
Trial Key	10.0%	1.0
Potato	9.3%	3.2
Smithing Template	1.7%	1.0
Bucket of Pufferfish	1.3%	1.0
Music Disc	1.0%	1.0

Chest loot: nova_structures:chests/toxic_lair/kitchen

Item	Chance	Avg. stack
Baked Potato	81.0%	7.6
Onion	72.3%	2.8
Tomato Seeds	62.3%	2.9
Apple	33.7%	4.4
Mushroom Stew	26.7%	1.1
Raw Cod	26.0%	2.2
Cooked Cod	24.3%	5.6
Honey Bottle	13.0%	1.4
Poisonous Potato	12.0%	1.1
Suspicious Stew	12.0%	1.0
Potato	11.0%	2.2

Chest loot: nova_structures:chests/toxic_lair/toxic_boss_vault

Item	Chance	Avg. stack
Bow	100.0%	1.0
Block of Emerald	60.3%	2.0
Block of Iron	59.7%	3.4
Block of Gold	58.3%	2.1
Ominous Bottle	57.3%	1.0
Arcane Essence	45.7%	3.1
Enchanted Book	42.7%	1.0
Pearlescent Froglight	32.0%	9.9
Scroll	31.3%	1.1
Verdant Froglight	29.7%	10.0
Golden Apple	28.0%	1.8
Ochre Froglight	27.3%	10.0
Block of Diamond	25.3%	1.1
Common Ink	9.3%	1.6
Uncommon Ink	4.0%	1.2
Blank Runestone	3.3%	1.0
Tipped Arrow	3.3%	15.0
Smithing Template	3.0%	2.0
Banner Pattern	2.7%	1.0
Skeleton Skull	2.0%	1.0
Emerald Stoneplate Ring	1.0%	1.0
Rotten Spell Book	1.0%	1.0
Ring of Expediency	0.7%	1.0
Ring of Recovery	0.7%	1.0
Silver Ring	0.7%	1.0
Amulet of Teleportation	0.7%	1.0
Fireward Ring	0.3%	1.0
Frostward Ring	0.3%	1.0
Ring of Invisibility	0.3%	1.0
Poisonward Ring	0.3%	1.0

Tips

The mob rooms spawn groups of up to sixteen zombies and cave spiders. Fight from a narrow corridor or doorway so that only a few enemies can reach you at once. Witches are the most heavily weighted spawn in the lair, so deal with them early.

The boss vault has the strongest loot in the lair, so check it first when you are in the boss room. The Toxic Boss Key is the boss spawner's reward, so the key is only obtained through the boss encounter.

Because the lair is rare and sits in swamp biomes, it is worth locating one before committing to a long fight.