Lightsabers are synonymous with Star Wars, but there's another Force weapon which is deadlier to Jedi – and it was wielded by Yoda's little-known master from the Vagadarr system. While Yoda was trained as a Jedi in the usual way (by a being named 'N'Kata Del Gorm' in Legends canon), he had another master who tutored him in a far rarer ability – Stonepower. This was a version of the Force which applied only to the shimmering blue rocks of one unnamed planet.
In Star Wars #27 – by Jason Aaron and Salvador Larrocca – Yoda investigates a mysterious planet, finding it populated solely by children, who have broken into warring groups. The children carry weapons made of a blue stone which Yoda is shocked to realize he can't manipulate using the Force. After an attempt at diplomacy, Yoda is taken to a gigantic blue mountain – the source of the material – and sentenced to travel inside to its heart, where the children believe he'll be consumed. Instead, Yoda discovers a young man – Garro – who is able to control the blue stone with his mind. Yoda requests to become the young warrior's student, even declaring the boy his new master in a moment of impressive humility.
Yoda Took a New Master to Learn Stonepower 
