Kheimon Drakainathea

is the strongest technique among the arsenal of Fuyumi Tsukihime.

Description
Kheimon Drakainathea is the ultimate technique of Fuyumi, where she channels cold winds and frost into Mistilteinn causing it to be wrapped in ice and winds, which results in it turning into a pillar of icy wind and coldness that extends at least one hundred meters into the skies losing its original physical form. Throughout several fights against powerful enemies, Fuyumi has relied on her Kheimon Drakainathea as a finishing move as living flesh and blood can't survive it, however, it isn't unbeatable as it lost to Jaryuu's Geppa: Moon and the Dragon.

Though after Fuyumi realized her true power, she used Kheimon Drakainathea to break through even Charlotte's Senben Junka albeit it was held back for a moment, as well as overpower Geppa: MD. This technique has grown powerful enough to freeze a mountain over and change the atmosphere.

Weakness
Activating the technique requires some time, making it ineffective during quick exchanges, but she could activate it without the normal charge time albeit not as powerful as shown in the Twenty-Six Martyrdom in her battle against her elder sister Kamehime Tsukihime. The technique also requires a significant amount of magic.

Trivia

 * Kheimon Drakainathea (χειμών δράκαινᾰθεᾱ́) means "Winter Dragon Goddess" in Greek.