Life Link

A life link (ライフリンク) is a bond formed between certain beings.

If one dies when the other lives, they will be brought back to life, so long as the other person continues to live. When both of these creatures are killed at the same time, they will not come back to life.

Ragna the Bloodedge and Nu -No. 13- have a life link between them, as well as Noel Vermillion with Hazama.

A life link in top form, according to Yūki Terumi, should make the two people stronger.

According to Kokonoe Mercury, the basis of the life link theory lies in reciprocal interference.