Long-range attacks simply could not penetrate through the darkness and reach the palace. Lin Xun used his Star Lord Canis sword for an attack, but as the sword barely crossed the boundary of darkness, it fell uncontrollably to the ground.
If it weren't for Valkyrie picking it up and returning it to him, Lin Xun would have lost a legendary-grade weapon.
[...]
['Flandre' explains to you, strictly speaking, your attacks are guided by your consciousness, incapable of resisting the erosion of Malice.]
[Unless you possess sufficiently potent extraordinary energy or an extraordinary weapon, you cannot penetrate the dark space and inflict damage on 'Assad'.]
[Although 'Flandre' and 'Jinmu' are powerful enough to kill 'Assad', they can't step foot in the dark space...]
"Ha! Why didn't you say this earlier?"
Lin Xun quickly devised a sensational move.
He opened the item bar and clicked on the 'Bloody King of Swords', gifting it to Flandre.