You get spiders in MySims from the Desert cemetery. Prospect the graveyard area near the Ghost Cave to find them.
If you want the shortest answer, head to the Desert. Look by the dinosaur fossil and mausoleum cave landmarks, then keep prospecting the cemetery until the Spider essence appears.
Spider is a Spooky essence, so it fits right in with the darker Desert finds in MySims. You can usually grab other spooky essences and nearby Desert items during the same trip.

Exact Spider Location In The Desert

You find Spider in the Desert cemetery. This is the best-known essence location for this item.
The Spider essence appears as a Prospecting essence in the Desert Cemetery, near the Ghost Cave, according to the Spider page on MySims Wiki.
Find The Graveyard Near The Dinosaur Fossil
Start by heading into the Desert and move toward the graveyard area. The dinosaur fossil serves as a useful landmark since the cemetery sits close to that part of the map.
Use The Mausoleum Cave And Ghost Area As Landmarks
The mausoleum cave and the ghost area help you stay in the right part of the Desert. If you see spooky details, skeletons, or other Desert essences nearby, you are close to the right spot.
Prospect The Cemetery Until Spider Appears
Once you reach the cemetery, use prospecting on the ground and check the nearby tiles. Spider can take more than one try, so keep working the area until the Spider essence shows up.
What You Need Before You Can Reach The Spot

Unlock the Desert before you can reach the cemetery, and make sure you have the right star level. Learn how prospecting works, since you find Spider through that action, not by talking to a Sim.
Unlock The Desert At Star Level 3
The Desert opens after you reach Star Level 3 and unlock it from Town Square. Once it is available, you can travel there and start checking essence spots.
How Prospecting Works In MySims
Prospecting in MySims is part of the regular gathering loop in build mode and around the world. Look for marked spots, search them, and collect the essence that pops out, including things like studious essences, geeky essences, and happy essence in other areas.
Why Spider May Not Show Up Right Away
Spider does not always show up on the first dig. If another essence appears, keep prospecting nearby tiles in the cemetery until the Spider essence drops.
Best Nearby Essences To Grab On The Same Trip

Make your Desert trip count by collecting nearby essences too. Pair Spider with other spooky, Desert, and nearby map finds for more requests.
Graveyard And Cave Picks
Around the cemetery and cave area, look for spooky items like a voodoo doll, black rose, amethyst, sapphire, and amber. Desert spooky finds often sit close together, so you can sweep the area in one route.
Hilltop And Orchard Finds
If you move away from the graveyard, you may also run into topaz, jade, garnet, lime, lemon, sunflower, yellow crayon, and red crayon in nearby zones. These are handy when you want to stock up for different build requests.
Junkyard Fun Cave And Fishing Dock Extras
A longer trip can also pick up tina doll, tim doll, elephant, puppy, tiger, hopi doll, pencil, globe, rocket, alien, star, robot, gears, diamonds, spades, hearts, clubs, kissing fish, fish bones, tiny shark, beach ball, gold, moai, and mega lizard. These extra stops help when you want more variety than just Desert and spooky items.
How Spider Fits Spooky Builds And Requests

Spider works well in spooky builds because it matches the mood of the Desert cemetery and other dark themes. It also fits requests that ask for creepy, odd, or Halloween-like materials.
Themes That Pair Well With Spider
Spider pairs well with forest essences, eyeball, black apple, thorn, dead wood, dark wood, light wood, metal, organic, and stone. It also matches Sims who want a be nice or be mean vibe with spooky flair.
Other Spooky And Forest Picks To Combine With It
You can build a strong spooky set with action figure, video game, 8-ball, red apple, green apple, yellow blossom, rainbow trout, clown fish, tire, crab, octopus, snake, cherry blossom, plum blossom, rose, orange, chocolate cake, cake, gingerbread man, bacon, knight, terra cotta, magic carpet, musical note, soccer ball, jack o’lantern, pawn, and rook. Mixing Spider with these gives you more options for eerie or playful requests.
When It Is Worth Farming Extra
Farm extra Spider essences when you work on spooky Sims. You should also farm extra if you know a request chain is coming.
Save a few if you like decorating with dark, creepy, or Desert-style builds.