Maybe you've been put through an Emergency Transformation; maybe a magic spell backfired in an epic fashion; maybe someone decided it would be fun to mess with your life (you know, For Science!); or maybe it's just the way things work in The Verse you're currently a denizen of. Any way it went down, you are now literally physically dependent on something (or someone) else for your continued existence. You get bonus points if your counterpart is also dependent on you, but this often is not the case. If the link also transmits feelings, pain or injury, this trope overlaps with Synchronization.