[CLOSED PR] New antagonist : Brain slugs

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[feature] [game-objects] [gamemodes] [input-wanted]
About the PR
Introduces a new antagonist to the classic and RP servers : Brain slugs.
The design document is here: https://docs.google.com/document/d/1XNOu...ZQdY8/edit#
I won't go too in details about the abilities since they are already detailed in the design doc.



This antagonist is centered around stealing organs, infesting corpses and offering a final evolution allowing it to live as a powerful alien monster.

Brain slugs spawn into the shift inside the body of the player's character. They may gain stronger abilities such as a way to turn turfs into deadly acid, or to create critters to fight for them by collecting organs off the crew.
Once sufficiently fed, they are allowed to become a terrifying monster allowed to roam through the disposal pipes, looking to feast on the crew. They may also revert from this form to the previous one after a while.



If they desire to, or die, the slug may exit the host's body and possess a dead human or a living small_animal. Doing so doesn't give any points to the slug.

Full icon list;


Animated icon border in action;


A few demos:
Disposal scuttling, restraining spit to prevent movement and organ theft. (Speed has been adjusted since)


Infesting a corpse with broodlings who come out later, acid trail, and broodling agression.


The disposal movement code is based on https://github.com/goonstation/goonstation/pull/11771 . Many thanks to Azrun for sharing their method!

Why's this needed?
Keeps the game fresh by allowing a new alternative to the list of antagonists currently present in the game.
Offers a different dynamic to the antagonists currently present on the RP servers.

Changelog

Code:

changelog
(u)Bartimeus973
(*)New antagonist on the RP and classic servers: Space slugs have invaded the station! These beings may try to possess the dead, or animals, and pass as crew waiting to harvest an innocent bystander's organs!

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