[Feat] _DEN Slime Markings

[Briffit-Solrad]

About the PR

Ported the markings from prebase Den's _DEN/Mobs/Customization/SlimePerson/ texture directory.

Why / Balance

Making Portfiend's life a little easier since 2026

Technical details

As there didn't seem to be a proper file tree for mobs yet, I added that too. Resources/Prototypes/_DEN/Entities/Mobs/Customization/Markings now exists. So does Resources/Textures/_DEN/Mobs/Customization/Slime. Yay. Otherwise, code was written in accordance with Portfiend's guide.

Media

Requirements

• I have read and am following the Macrocosm Pull Request Conventions .
• I have added media to this PR or it does not require an in-game showcase.
• I have tested my changes and additions in-game.

Licensing

• All code in this pull request can be licensed to MIT.

• (OPTIONAL) I give permission to seeing this feature upstreamed to Macrocosm in the future.

Breaking changes

Changelog

🆑 Briffit

• add: Added the anatomical and cyclops eye markings for Slime People.

[ghost]

RSI Diff Bot; head commit eef8301 merging into f0058c1
This PR makes changes to 1 or more RSIs. Here is a summary of all changes:

Resources/Textures/_DEN/Mobs/Customization/Slime/anatomical.rsi

State	Old	New	Status
bones-pelvis			Added
bones-ribs			Added
bones-skull			Added
organ-bladder			Added
organ-brain			Added
organ-heart			Added
organ-large_intestine			Added
organ-liver			Added
organ-lungs			Added
organ-pharynx			Added
organ-small_intestine			Added
organ-stomach			Added
organbones-bladder			Added
organbones-bones			Added
organbones-heart			Added
organbones-large_intestine			Added
organbones-liver			Added
organbones-lungs			Added
organbones-pharynx			Added
organbones-small_intestine			Added
organbones-stomach			Added

Resources/Textures/_DEN/Mobs/Customization/Slime/cyclopseye.rsi

State	Old	New	Status
cyclopspulseeye			Added
cyclopspulsering			Added