Straxus' Time Ring

Straxus used a Time Ring to find the Eighth Doctor during the Morbius incident. Lucie Miller stole it from him. (AUDIO: Sisters of the Flame)

The Doctor then tried to use this time ring to escape the Sisterhood of Karn's dispersal chamber. (AUDIO: The Vengeance of Morbius)

He later used another one to travel to the Doctor's TARDIS as the Doctor tried to travel to the end of the universe. (AUDIO: The Great War)