CU and Wave God

Overview
CU and the Wave God is an adventure mod for Minecraft 1.20.1 Forge: it adds two textured creatures, CU and the Wave God, along with their respective pixel dimensions, two sets of crystal equipment, and thirteen dishes.
The first time you enter a save, you will directly receive a 16-page CU and the Wave God Guide; right-click to open it and look up how to play.
All items are gathered in a newly added "CU and the Wave God" page in the Creative mode inventory, and can also be found through the search page.

Content
Two creatures: CU and the Wave God, with default health 91, armor 78, and attack 67. They will not attack each other; when they meet, they will stand still facing each other and play a theme song of about 132 seconds, and they will not fight even when the song ends. They prioritize chasing players, and secondly attack other creatures that come close; when the player enters the Nether or the End, they will teleport near the player and continue chasing.
Evolution: After the player is killed by them, the one that dealt the killing blow evolves one level, becoming larger in size and increasing health / attack / armor. At the moment of evolution, it is invincible for a few seconds, up to a maximum of five levels.
Configuration panel: By default, press P to open it. You can change the two creatures' health, armor, attack, attack targets, and music toggle; the configuration is stored in config/splitter_beast.properties, and changes take effect immediately on creatures already spawned in the world.
Infection ground: The CU Block / Wave God Block beneath the creatures infects one ordinary block nearby every 3 seconds. Infected blocks become infection blocks and continue spreading outward, up to 16 blocks from a single source. It only infects solid ordinary blocks, does not touch entity-bearing blocks such as chests, and does not spread within the CU / Wave God dimensions.
Instant tree growth: A whole CU Tree / Wave God Tree grows instantly on infection blocks. Before growing, it checks that the top can see light, that there are no other logs or leaves within 6 blocks, and that the space for the whole tree is empty, so trees will not crowd together and will not grow on walls.
Two dimensions: The CU Dimension "CU Wasteland" and the Wave God Dimension "Wave God Abyss", paved with flat dimension rock and core blocks. Each dimension has three types of structures—obelisks (altars), ruins, and villages—as well as large patches of dimension trees. All three structure types contain chests that can yield crystals, seeds, food, music discs, and equipment.
Blocks: Dimension rock, logs, leaves, saplings, planks, slabs, stairs, torches (can be placed on walls), pixel lamps / tide lamps, infection blocks, and two types of portal blocks.
Equipment: Two sets of crystal equipment, each containing a sword, pickaxe, axe, shovel, hoe, four pieces of armor, a shield, and a trident. The shield has 4096 durability; the trident deals about 62 melee damage, has 3072 durability, and can be charged and thrown. Wearing all four armor pieces of the same family activates the set bonus: the CU set grants Resistance, Absorption, and Haste; the Wave God set grants Water Breathing, Dolphin's Grace, and Regeneration.
Food: 13 kinds of dishes, each with different recipes, respectively granting buffs such as Speed, Night Vision, Resistance, Absorption, healing, and Water Breathing; there are also two fruits, Pixel Fruit and Tide Berry, which can be eaten directly.
Other: A music disc recording the "Song of Encounter", dimension fire seeds, purification powder, and 12 advancements.
Crafting and Acquisition
Seeds: Mining CU Blocks / Wave God Blocks with a pickaxe without Silk Touch drops 2–4 crystals and 1–2 seeds; killing the two creatures also drops seeds. Seeds are planted on farmland like vanilla wheat, and when mature yield Pixel Fruit / Tide Berry.
Crystals: Obtained by mining core blocks, killing creatures, and looting chests in the dimensions; they are the main material for equipment and items.
Equipment: Crafted with the corresponding crystals plus sticks or core blocks. For example, a sword is 2 crystals + 1 stick, a trident is 3 crystals + 2 sticks, and a shield is crystals surrounding one core block.
Portal: Mine core blocks with a Silk Touch pickaxe and frame them in a ring—the inner empty space must be 2–4 blocks wide and 3–5 blocks high, and the entire surrounding ring must be CU Blocks (or Wave God Blocks). Placing the last block will automatically attempt to light it, or you can right-click the frame with flint and steel or a "Dimension Fire Seed".
Three items: Guide = book + both types of crystals; Dimension Fire Seed = flint and steel + both types of crystals; Purification Powder = both types of crystals + bone meal, crafting 4 at a time.
Food chain: Grind Pixel Fruit into Pixel Powder, knead the powder with a milk bucket into dough, and bake it in a furnace into Energy Bread; mix the powder with eggs into Raw Pixel Noodles, used to make Abyss Seaweed Rolls; the remaining dishes are then paired with vanilla ingredients such as fruit, sugar, eggs, kelp, and bread.
Installation
Install Forge corresponding to Minecraft 1.20.1 (the project uses 47.4.0).
Put the jar into the .minecraft/mods folder; keep only one version in the same folder, and delete older versions first.
After launching the game, a "CU and the Wave God" page will appear in the Creative mode inventory; the first time you enter a save, you will receive the guide book.
Known Issues
The two creatures do not spawn naturally in the Overworld and must be summoned using the spawn eggs in the Creative mode inventory; natural spawning only occurs in the "CU Wasteland" and "Wave God Abyss" dimensions.
The two dimensions are flat terrain, permanently set to night with no sky light, so it is rather dark inside; it is recommended to bring torches or lamps.
The inner empty size of the portal frame must be between 2–4 wide and 3–5 high; it will not light if it exceeds this range.
Infection blocks will continue spreading up to the 16-block limit; if it grows too aggressively, you can right-click with Purification Powder to turn infection blocks within a 5×5×5 range back into grass / stone in one use.
Currently there is only a Forge 1.20.1 version, with no Fabric version.