The Four Immortal Sisters Challenge

CREDIT: Scklsy @ Mod The Sims on September 30, 2014

Preface

This challenge is inspired by and modeled after the original challenge written by tigger89 for TS3. Scklsy decided to convert it to Sims 4 since they had so much fun with it in TS3, and there aren't many challenges for TS4 yet! I haven't gotten very far in this challenge yet, but it's been fun so far! You can read the original here!

What Is The Four Immortal Sisters Challenge?

The challenge is based off the four sisters of the elements who want to improve their town by bearing children and populating the town with them, whilst drinking cowplant milk to prolong their everlasting youth.

Getting Started

Begin by creating a new game and creating your four sisters, based off the four elements of nature (though you don't have to call them that). They must have the following traits:

Fire - Romantic, Hates Children, Outgoing
Aspiration must be Love (Serial Romantic) or Popularity (Friend of the World).
Water - Perfectionist, Neat, Family-Oriented
Aspiration must be Food (Master Chef).
Air - Genius, Bookworm, Loner
Aspiration must be Creativity (Bestselling Author) or Knowledge (Nerd Brain).
Earth - Active, Self-Assured, Loves Outdoors
Aspiration must be Athletic (Bodybuilder) or Nature (Angling Ace or Freelance Botanist)

Once you are happy with your family, double-check that everyone is related as sisters (believe me, I've made the mistake of not making sure a couple of times now) and accept the family. Now move into an empty lot, or a premade house.

You are free to decorate the sisters' house as you wish, but make sure every element has its own location (I made 3 separate buildings and a hedge for Earth, but you can use a big house if you wish, it's up to you). You are allowed to cheat for your initial house (buying or building) but you must have around $1,000 simoleans when you're done, and you cannot buy luxuries other than what is listed below (you must buy those with earned simoleans). The sisters ARE allowed to go to each others' quarters, but they cannot sleep there, or take the responsibility of another (example, Fire can't take care of the kids, Air can't cook, etc). This is a rough description of what every sister should have:

Fire - Double bed, fireplace, bar, bathroom
Water - Kitchen, bathroom, bed, kids' room/s with beds and children's toys (you can buy cribs if you wish but I think they're useless since you get a free one when you give birth anyway)
Air - Study (with computer and bookshelves), bedroom, bathroom, kid's learning objects (such as the drawing table)
Earth - Bed, exercise equipment (treadmill, punching bag, etc), gardening objects, bathroom

Roles of the Sisters

Fire - She is the only sister who is allowed to leave the lot freely. Her job is to search out men (or women, if you have mods for same sex pregnancy), develop relationships with them (without becoming too attached) and bear their children. She is not allowed to marry and the men are not allowed to move in. She may bring one man or woman home each night, and may try for baby once every 24 hours. Additional woohoo that is not trying for a baby (same and opposite sex) may occur as often as desired. She also must make friends to lure into the cowplant's trap, and grant the sisters their immortality (see below). The skills she is allowed to use and develop are any social skills (Charisma, Comedy, Mischief etc), and Mixology.

Water - She is the caretaker of the young children, and of the house. Cooking, cleaning and repair duties fall to her, as well as the care of infants. The skills she is allowed to use and develop are Cooking skills, and Handiness

Air - She is the keeper of knowledge. Once children become old enough to learn, she is responsible for teaching them. As the children get older, she tutors them and helps them with homework as well. The skills she is allowed to practice are Logic, Writing, Instrument skills (Guitar, Violin, piano etc), Painting, and Rocket Science.

Earth - She is the gardener, and fitness master. She is responsible for growing food and fishing to sell and eat, and training the children in athletics. She is allowed to leave the lot to fish, and search for cowplant seeds, which grants the sisters their immortality.

UPDATE: If you wish, 2 out of the 4 sisters may hold a day job. Choose carefully which sisters will go to a job. The Water sister will have to take care of kids constantly, so naturally, she isn't a good candidate. If you find yourself not playing with a sister very often, I would pick her. Also beware of the career you choose for her, due to the skills they are allowed to learn. The Air sister may not make a good chef, but she could make a pretty darn good writer!

NOTE - If social skills (Charisma, Comedy, Mischief) are gained through an uncontrollable event such as socializing with other sims, that is okay but they cannot practice their speech at a mirror, etc. The only sister allowed to practice social skills in such ways is the Fire sister.
NOTE 2 - The sisters are allowed to use their skills to earn money for the household (painting, gardening, fishing etc). But remember, only 2 out of the 4 sisters may get a day job!

Gaining Immortality

This is achieved by getting the cowplant. The sisters will require one cowplant each, and if a cowplant dies, you must immediately replace it as soon as you can. The cowplant is obtained by: fishing Oasis Springs Desert Bloom Park’s watering hole or in the waters of the Forgotten Grotto;
exploring space with a rocket (which the Air sister should make);
or digging for treasures, which can be harvested by grafting a specific plant type’s cuttings with one another (Daisy & Strawberry gives Dragonfruit, after which Snapdragon & Dragonfruit gives a Cowplant Berry)

The easiest way is to fish for it, but you can do whichever you please For an extra challenge, aim for all 3.

Once you have your cowplant, be sure to feed it once every 12 hours so it doesn't eat one of the sisters! (I recommend saving before feeding the cowplant if you see it has a cake tongue). The Fire sister lures in people with her charm to feed the cowplant. Once the cowplant is fed, you can milk it to get the Essence of Life drink, which adds extra days to your sim's lifespan and makes them instantly happy.

UPDATE: This step isn't required, but will make your sisters truly immortal, and is good to have in case one of your sisters do accidentally have an accident. The Earth sister may learn to craft the seed to, and grow, the Death Flower (this guide may help you, scroll down a bit). Every sister should at least have a couple, so if a sister has an accident, another can save her by bringing her the flower.

NOTE - If you're having trouble getting NPCs to be eaten by the cowplant, you can try moving them in and having them attempt to feed the cowplant themselves (but you must immediately deduct any funds they add to the household in a way that you cannot use). Reminder that if they survive the cowplant, it will still produce milk but this does not give you the "Essence of Life" drink. So a sim must die for the sisters to remain immortal.
NOTE 2 - If you're a little slow-paced like me, you can turn aging off until you get the cowplant.

Win Conditions

1. Most of the town has been eaten by the cowplant and is replaced by the children of the Fire sister.
2. You get bored :P

Get to Work

The sisters may be aliens if you choose them to be so, but the CAS rules (traits and aspirations) still apply.

The sisters are not allowed to join a profession. However, they may open a retail business if they have the funds to do so.

Two new skills came with GTW. The Water sister may learn the Baking skill, and the Air sister may learn the Photography skill.