Force Chain
the ancient Jedi discovered this ability in certain individuals, who learned that they had forged a mental link to one or more other Jedi. The exact mechanism of the linkage was unknown, and many Jedi considered it to be the will of the Force whenever a Force Chain was created. While connected by this link, the strengths of individual Jedi could be used by the others, allowing them to work together against a common enemy. Once discovered, the Force Chain could be used to augment strength and maintain health. However, the link created by the Force Chain also linked the individual Jedi together when they were injured, and all members of the link felt the pain of the others at the same time. It was believed that, should the individual from which the Force Chain began were die, then all the Jedi in the link would die as well.