Istara

Istara is the Wind Maiden. She's a skilled swordswoman who lives in the Picodon Jungle and protects it from the invading forces of Gandrake. she carries an immense hatred towards Malbec for mechanizing the forest's creatures, including Arachnolia. Istara ultimately mercy-kills the giant spider because she'd rather have Arachnolia dead and her spirit freed then allow her to live on as a soulless machine under Gandrake's control.

The Sword of Wind is actually her katana, which transforms when she releases it full power.

Trivia

 * Her Japanese name, Maki, can refer to whirlwinds.
 * Her theme is "Aeolic Guardian", the longest Maiden theme in the game, which also plays when you get to fight her at the end of the arena.