Structures

Where each structure spawns, how hard it is to find, what it drops, and what will attack you. Rarity comes from the mod's worldgen settings and drop rates from its loot tables, so these are the real numbers rather than estimates.

Wave spawners trigger on proximity, not interaction — walking within range starts the fight. On completion the rewards drop as loose items and the spawner goes on a 2-hour cooldown; anyone who took part is permanently locked out of looting that one again, so it is not a farmable respawn.

Spaceship

Overworld

The main source of Willpower Shards, and where Alien Blood Splatter is found. A wave spawner inside summons Manhunters when you get close.

One attempt per 60×60 chunks (about 960×960 blocks)
Biomes
Desert, Badlands, Eroded Badlands
What fights you
Manhunter · 120 HP · 3 per player, up to 15 · Wave spawner, triggers within 100 blocks

Drops

  • Willpower Shard3-6 guaranteedDropped on clearing the wave
  • 1 in 4 spaceships contains a Willpower Battery block — the other three are identical without it.
  • Manhunters are not a boss wave, so they get no health or damage multiplier.

Heads up: The guidebook says Manhunters have 220 HP and drop 1-3 Willpower Shards. The data says 120 HP and 3-6 shards. The numbers above come from the code.

Arkillo's Arena

Overworld

A boss arena. Getting within 64 blocks summons Arkillo as a single boss-scaled fight.

One attempt per 120×120 chunks (about 1920×1920 blocks) — the rarest surface structure
Biomes
Stony Peaks, Stony Shore, Jagged Peaks, Frozen Peaks, Windswept Hills and Gravelly Hills
What fights you
Arkillo · 1,500 HP · 1 (boss) · Wave spawner, triggers within 64 blocks

Drops

  • Fear Battery
    70%
  • Arkillo (suit ingredient)
    30%
  • You get exactly one of the two drops, not both — 70/30 either way.

Heads up: The guidebook lists Arkillo at 1024 HP. The code gives him 1000 base with a 1.5× boss multiplier, so 1500. The numbers above come from the code.

Abandoned Street

Overworld

The only source of Mutant Genes, needed for Wolverine and Deadpool. A Sentinel stands in the street.

One attempt per 72×72 chunks (about 1152×1152 blocks)
Biomes
Anywhere plains villages generate
What fights you
Sentinel · 500 HP · 1 · Placed directly in the structure — no spawner

Drops

  • Mutant Gene
    40%
  • Technology
    35%
  • Advanced Technology
    5%
  • Redstone
    100%
  • The Sentinel can despawn — it is not marked persistent, so deal with it while you are there.

Heads up: The guidebook says Mutant Gene is a 15% drop. The loot table says 40%. The numbers above come from the code.

Soul Sand Valley Ruin

Nether

An underground Nether ruin full of Suspicious Soul Soil. Bring a brush — this is where Souls come from.

Roughly one per 44×44 chunks (about 704×704 blocks) once the 25% frequency roll is applied
Y 33 to 115, biased toward the bottom
Biomes
Soul Sand Valley

Drops

  • Soul
    14%
  • Gunpowder
    21.5%
  • Ghast Tear
    21.5%
  • Coal
    21.5%
  • Bone
    21.5%
  • There are 57 brushable blocks per ruin, so expect about 8 Souls if you brush all of them.
  • A Wither Skeleton with 499 HP is placed inside and will not despawn.

Meteor

Overworld

A small crater holding Cosmic Debris blocks — the material behind the Fantastic Four suits.

One attempt per 64×64 chunks (about 1024×1024 blocks)
Biomes
Plains, Beach, Forest

Worth mining

No chests here — the ingredients are in the blocks themselves.

  • Cosmic Debris2 per meteorMine the 2 Cosmic Debris blocks — pickaxe required
  • Mr. Fantastic alone needs 4 Cosmic Debris, so you need at least two meteors.
  • Silk Touch gives you the block instead of the debris — mine it normally.

Rock of Eternity

Overworld

Shazam's chamber. Right-click the throne while it sits on the Engraved Lodestone to claim the Book of Champions.

By far the rarest — only 0.5% of attempts succeed, so roughly one every few thousand blocks
Y -30 to -10
Biomes
Lush Caves

Worth mining

No chests here — the ingredients are in the blocks themselves.

  • Book of Champions1Right-click Shazam's Throne while it stands on the Engraved Lodestone
  • No hostile mobs spawn inside its bounding box.
  • The throne only gives the book while it stands on the Engraved Lodestone — elsewhere it is just a chair.
  • The barrels and bookshelves inside are decorative and generate empty.

Ooze Pools & Trucks

Overworld

Ooze is used in several suits. Pools are far easier to find than trucks — the truck is just a themed cache of 40 ooze blocks.

Trucks: one attempt per 94×94 chunks. Pools: a 1-in-3 chance per chunk, so they are common
Pools spawn Y 60 to 200
Biomes
Trucks near plains villages; pools in every Overworld biome

Worth mining

No chests here — the ingredients are in the blocks themselves.

  • Ooze40 blocks per truckCollect with an Ooze Canister; pools hold plenty more
  • Standing in ooze gives Slowness II and Blindness for 2 seconds, refreshing while you stay in it.
  • Craft an Ooze Canister (steel ingot, glass pane, steel ingot) and right-click a source block to collect it.
  • Pools never generate underwater.

Starro Clones

Overworld

Thin plates on the deep ocean floor, used for the Jarro block and the Starro Controlled alts.

A 1-in-75 chance per chunk, on the ocean floor
Biomes
Deep Ocean, Deep Cold Ocean, Deep Lukewarm Ocean, Deep Frozen Ocean
  • They give off a faint light, which helps when scanning a dark ocean floor.

Looking for what to do with the materials? The craft planner works out how much you need, and ore depths covers the mining side.