Sockets

Sockets in items allow for spell jewels to be imbued to add permanent effects. These are added during the crafting process, though there are occasionally ways to add them after the fact at great cost. This is usually in the form of a spell with expensive components or one-time blessing.
 * Higher tiers of items are created with sockets automatically, and you can always expect the same number of sockets to appear in those items.
 * If an item has more than one socket, each socket has to have a separate spell jewel. You can't stack the same bonus multiple times.
 * Items can only have one socket added through the various methods available to do so. You'll never get more than +1 additional socket for a specific item, and these are best saved for higher tiers of items since the cost is prohibitively high.