It wasn't particularly difficult to break through from the Peak of Martial Saint to the Martial God Realm, it was just very time-consuming and consumed a lot of mana.
The ethereal Martial Soul needed to manifest in the material world, which required refinement by mana, similar to forging a sword. You would use mana as a hammer to vigorously forge the Martial Soul, this Sword Embryo, and only after thousands of hammerings and hundred refinings could a fine sword be forged.
However, the better the quality of the Sword Embryo, the higher the requirements for the forging skill, and similarly, the better the quality of the Martial Soul, the more mana it would need during the refinement process.
Dorothy's Fairy King Martial Soul was undoubtedly of the highest grade, not just a King Soul, but also a first-class unyielding Hero's Soul, equivalent to an exceptional Sword Embryo.
And her mana...