Cobweb

Cobwebs are objects that can be found in underground areas. They are typically grouped in clusters, alongside the edges of walls or ceilings.

Cobwebs can be collected through the use of tools, such as the pickaxe, axe or even a sword.

Note that until harvested, cobwebs are sticky and slow player movement through them in any direction.

Although cobwebs may seem useless, once harvested they can be used to make Silk which is crafted with Wood to make Beds. Cobwebs can also be used with Bones to craft Necro Armor. Cobwebs can be placed, and because they slow players' movement, they can be used to prevent fall damage. Note that in 1.0.2 patch they have been patched to correctly prevent fall damage, and in previous versions the user would die as soon as they touched the ground (only if the height was high enough; the damage was relative to the fall).