The Clockwise War

In the Tower of Silent Memory upon the desert of High Remorse on Gallifrey, the Time Lord Bellator ascends, followed by the Twelfth General, to prepare for a ritual that will lead him to his final regeneration. Telling the Time Lords to hurry up because "I've heard this malarkey eleven times already", Bellator begins to regenerate, but something goes badly wrong. Part-way through the process, he ends up twisted and elongated, and collapses to the floor, dead, before dissolving in an orange puddle on the ground. A Time Lord soldier arrives to inform the General that all six regenerations that have taken place in the last hour have failed and led to the deaths of the people involved.