A Nest.

Murder of crows
We are the carriers.

We act as everyone else.

We provide.

We eat, we sleep, we drink, we live.

Until the glorious nest needs to be opened.

Then all it takes is one swift swipe.

Nests are the servants of the Convocation. The Convocation takes them to the Bleak Shore and somehow makes it so they can literally nest within their bodies. Nests can release The Convocation from their mouths or by cutting themselves open. The wounds can heal themselves swiftly, but leave large, ugly, scars in the process.