Chest Cavity
Chest Cavity lets you use a 'chest opener' to access a secondary inventory. There are some items already in it, but those probably aren't important so you can take them out to make room for other stuff*.
It also adds a variety of drops that are similar to the junk you discarded from your extra storage.
*Side effects may include shortness of breath, inhibited healing, inability to fight off infection, vulnerability to physical harm, weakness, loss of nutrition, difficulty walking or running, and sacrifice to Aztec gods.
Requirements
Requires Minecraft 1.16, and Fabric API.
Special thanks to Tild09, who has provided Chest Cavity with fantastic new textures!
Details
Most organs come in three tiers: rotten, animal, and human. Rotten organs (and small animal organs) are half as effective as human organs, and animal organs three-fourths a human organ. You start with a chest cavity full of human organs, but there is a little space to fit another organ in. If that's not enough, you can always make room...
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Hearts affect your health. Lacking a heart will kill you, and having a bad heart makes you frail. Better and more hearts will result in more health.
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Lungs affect your breath. Lacking lungs will kill you, and having fewer or worse lungs will cause shortness of breath. More and better lungs let you hold your breath longer.
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Ribs affect your hardiness. Lacking ribs can cause your death, for having fewer or worse ribs will make you vulnerable to harm. More and better ribs let you resist damage better.
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Muscles affect your strength and movement. Lacking muscles can cause your death, for having fewer or worse muscles will make you slow and weak. More and better muscles make you strong and fast.
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Spleens affect your healing. Lacking a spleen can cause your death, for having a bad spleen will slow your healing from food. More and better spleens make you heal quickly.
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Kidneys maintain your blood. Lacking kidneys can cause your death, for having fewer or worse kidneys can poison you. More and better kidneys are redundant.
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Spines let you move. Lacking a spine will kill you, because without it you can't move. More and better spines let you resist damage, but ribs are better.
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Livers remove toxins. Lacking a liver can cause your death, for having a bad liver will make toxins linger. More and better livers remove status ailments quicker.
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Intestines affect your nutrition. Lacking intestines can kill you, for having fewer or worse intestines makes food less saturating. More and better intestines increase saturation from food.
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Stomachs affect your fullness. Lacking stomachs can kill you, for having a bad stomach means food isn't filling. More and better stomachs increase fullness from food.
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Appendixes affect... well, it's your appendix! Lacking an appendix will kill you emotionally, because who would throw out their lucky appendix? More and better appendixes lead to good things, collect them all!
Many creatures have unique organs that have effects other than or in addition to the above, and some objects have special functions within the chest cavity. For example, a couple items you can craft before you even make your first pickaxe will negate the damage dealt by the chest opener once installed.
If you also have Anthropophagy installed you gain access to two variant hearts.
The Cannibal Heart is of variable quality, based on you cannibalism.
The Tethered Cannibal Heart is of animal quality, and rapidly returns your cannibalism to how it was when you first crafted the Tethered Cannibal Heart.
