Extinction Echoes

Creatures
Velociraptor — pack hunting over a shared territory, coordinated calls, trust that is earned or lost, and a memory of who hurt it
Tyrannosaurus — picks prey by size and hunger, guards a kill, sleeps off a heavy meal, defends its nest
Brachiosaurus — herds, browses, drinks, rests, and puts adults between a calf and a threat
Vorathyx — a 450-block abyssal leviathan, one to a world
Vorathyx Juvenile — hatches as a 5-block infant, raised by hand to a 75-block juvenile
Hatching egg entities for all three dinosaurs
Every creature carries hunger, thirst, stamina and injury, across 70 distinct behaviour states
The boss fight
Four stages read off the leviathan's health, each adding an attack
Three signature attacks: a ring of tornadoes summoned around the temple, an aimed water lance, a breaching tsunami
A bite, and a close-range crush pulse that tightens with every stage
Multipart body — thirteen hitboxes riding the spline, so the whole animal can be struck
Drops the Abyssal Staff (throws all three attacks) and the Vorathyx Egg
Containment
Five barrier grades — Light Enclosure Fence, Reinforced Mesh, Heavy Steel, Electrified, Containment Bulwark — each with pylons, service gates, transfer gates and vehicle gates
Barriers rated against every species' break force and escape skill
31 procedural blueprints across all five grades, from a small paddock to a titan lagoon
Staged construction with the Enclosure Construction Tool
Spatial assessment treating floor area and turning room as hard requirements
Breakout behaviour when an enclosure fails to meet an animal's needs
Devices
Enclosure Controller — reads the boundary you built
Power Unit and Backup Generator — fuel-burning, redstone-cuttable, with automatic failover
Fossil Analyser — eight fragments into a genome
Genetic Incubator — genomes into eggs, three times faster in a sealed powered building
Four feeders — Herbivore, Carnivore, Large Carcass, Aquatic
Enclosure Shelter, Viewing Platform, Secure Viewing Window
Security Camera, Floodlight, Alarm Beacon, Maintenance Station
Six enclosure sign types
Palaeontology
Fossil blocks generating underground in every overworld biome
Fossil Record Fragments → genomes → eggs → animals
Genome quality affecting the animal it produces
Teeth, bone and eggshell fragments as by-products
Tools and equipment
Leviathan Harpoon — throws a line that damages at range and hauls you in; crouch for a heavy braced strike
Abyssal Tide Charm — the survival route into the abyss, and back out
Enclosure Management Tablet, Blueprint Planner, Creature Transfer Unit, Fence Repair Kit
Raptor Training Whistle, Pack Noisemaker, Scent-Masking Paste, Field Flare, Raptor Field Journal
Prehistoric Island Chart
World
Abyssal Ocean — a dimension with its own temple and guardian
Prehistoric Island
Four prehistoric flora species — Araucaria, Cycad, Ginkgo and Tree Fern, each with logs, leaves and saplings, planted as layered communities
Documentation and polish
Containment Handbook and Keeper's Field Manual — two craftable in-game books covering the full chain, devices and feed values
19 advancements tracking the route from first fossil to the leviathan
Four original sounds, synthesised from oscillators and seeded noise rather than sampled
62 blocks, 41 items, 62 recipes — every item obtainable in survival