The Link is an ability that Partials have, It allows them to feel the emotions of other Partials around them to feel what they feel.

Example: You know when your feeling an emotion you use facial expressions and body language to express it without words, but partials send what their feeling over the link thats why they don't use facial expressions.

The link is also a very good war trait when partials fight against partials they can sense when another partials coming so the can tell whether their friend or foe however not for humans since they don't link.