Cobweb

Cobwebs are blocks with a gray/white texture that slows the player to about 25% of normal speed. However, just like Spikes, this does not affect monsters.

The cobweb can be destroyed with any tool (including the grappling hook), and unlike certain plants (vines and grass), it can be harvested. It is generally found in clumps of 1-7, but can come in very large groups (sometimes in over 30 all together). Following patch 1.0.6 cobwebs may be destroyed simply by touching them for a period of time.

Uniquely, Cobwebs end speed boosts (i.e. Hermes Boots) and negate fall damage when you land on them, at which point you continue to drop very slowly through them, however this is not useful as of 1.0.6 because they are destroyed on player contact.

Cobwebs also do not need to have a host block- they can spawn naturally in the air. A Cobweb will also stay floating if you remove attachments to its "host block" (if it has one), but it is uncommon to see this, as a tool will normally take out the web that would remain floating.

Cobwebs may also be used in combination with Bones to make Necro Armor. It also can be used on their own to make Silk which can craft beds and a variety of Vanity Items.

Cobwebs are quite common underground. Note that this does not mean below sea level, but merely underneath the surface. They can, however, be found naturally above ground.

They also can be used to prevent sand from falling, acting as any other solid block, at least on a pregenerated world.

