Although the Stars of Fury that was condensed with magic only required Legendary-level mana, the attributes of the Laws contained in it could fully exert the power of Stars of Fury. Besides, the most powerful Thunderbolt was paired with the Stars of Fury. Such a combination could be considered lethal for almost all below the Legendary level. Lansdale was a good example. Even a powerhouse of the Sanctuary-realm could not endure for long under such attacks.
Lin Li was able to break through the last realm all thanks to the three pieces of the debris of the stars he had. Otherwise, he would have inevitably been defeated by Thunderbolt, just like Lansdale.