As powerful as the First Sword Mark III had become, she was not a perfect ace mech.
Endurance was one of her greatest weaknesses. When she fought at full power, her energy reserves would not be able to sustain her output for a long time.
If Ketis had chosen to design the First Sword according to the Pure Version, then the ace mech would have benefited from Master Hijalt Mossclover's exclusive High-Density Energy Cells.
That would have significantly expanded the First Sword's energy reserves and enabled her to sustain herself for a much longer period of time.
Alas, Ketis opted to go for the Sword Fey Version instead, which meant that the First Sword had to forgo individual power in order to support the operation 33 sword fey.
Saint Dise was suffering from the consequences of this important choice.
If she continued to pilot a simple ace swordsman mech, then she would have remained confident in keeping the electro-reactant flight system active at full power.
