Fiends in low places

Although unable to see anything from his prison, Zartak: the once prince of Hell, feels the assault against the planes in his immortal bones.

Something is trying to free itself from somewhere.

Something with power.

A dragon.

A dragon with the power to rock the barrier between planes.

…

But not enough to break through.

The devil smiles.

Whoever it was has failed.

It needs more power than it commands.

Zartak smells desperation.

Zartak smells opportunity.

Summoning an imp, the massive devil composes a message to his soon to be ally.

The dragon shall be free but at a price.

The price of his own liberation.