First of all you can change what you look like with the Skin Changer Wand. Once you have your selection you now get to explore the world as a spider. You’ll notice significantly more spiders in the world of all different types and even human mobs that are automatically your enemy. They can, however, be made your friend by increasing your reputation with them by doing good deeds or giving them gifts, same with other spiders.
When you craft a web with 3 pieces of string in any orientation, you’ll be able to cocoon mobs and eat them for sustenance. This is actually the only way you’ll be able to refill your food bar even though you can still eat normal food. Although you can cocoon other mobs than humans.
What’s great is you can gather a group a spiders as your minions that can assist in fighting, carrying items for you and even exploding in combat. Spider eggs have to be gathered from eating cocooned mobs. Once you get the egg you can place it anywhere and it will grow into a spider after a few minutes. Depending on what mob is cocooned will aid in what special abilities the hatched spider will possess, like the boom spider that grows from an egg gathered from a cocooned creeper.
And what spider mod wouldn’t be complete without the ability to climb walls. Using the webbing you crafted earlier you can shoot that up walls just as you would a ladder and climb to your heart’s content.
And one more important thing you’ll need to know is you can only sleep during the day now and only in the specially crafted spider bed as shown below. Just shoot web at the ground twice in each spot to complete the bed.