Do /untrap to easily leave the Organism with cheats enabled or check the screenshots for how to build the Access Ritual. Installing JEI is very much suggested.
The mod's backstory:
Spoiler
Hey, you know how there's a couple dozen flesh mods? I noticed a good while ago on some day in december of 2023 that they tend to focus on a horror vibe. I then attempted to make a mod to fix that and make one that isn't meant to be specifically horrific- It looked like something you'd expect from the modding scene before the texture update, no offense to those who started and grew the modding scene, But anyway, I named that mod "Black Lung Mod" all before I gave it the permanent name:
"FleshCatcher"
Yeah, long story short: this is a remake of that shoddy work of garbage!
Ever wanted a forced vacation from your average day on the earth, mining in hell itself, or looting the literal void? Instead to be residing in a flesh purgatory that wails in corrupted pain whilst you tread it's skin and are suffocating the whole time? Well you've come to the right modder's doorstep!
This mod introduces Black Lung, Delirium, a few fleshy paintings, a lot of blocks, Mr. LeaveBlock, and the Organism! (you can just call her Gertrude, no need for formalities)
Gertrude is not a mob, they're the purgatory I mentioned- Mr. LeaveBlock isn't a mob either.
Also I won't spoil further but when I say purgatory I mean it in the literal sense, but don't fret, you can escape if you work hard enough! It's a challenge, after all.
DISCLAIMER: FleshCatcher is meant to be a challenge with workarounds. If you do not want to go to the Organism then you do not have to unless you want Receptor or certain blocks. Most fleshy blocks can be made using the Enrichment Table, which is expensive to make due to the challenge you would otherwise need to face. This mod will be continuously worked on and updated until I run out of ideas or die of old age/assassin sheriff hired by another modder because "this town ain't big enough for the two of us", whatever comes first.