Isawa Taeruko

Isawa Taeruko, cousin of Isawa Tadaka, was appointed Master of Earth by Naka Kuro almost immediately after the Second Day of Thunder.

Asako Kaushen
She helped the Grand Master of the Elements in defeating the bloodspeaker Asako Kaushen and retrieving the heart of Iuchiban, which ultimately would prove to be his downfall.

Death of Her Daughter
During the War of Spirits, the armies of Hantei XVI took the children of the Phoenix Clan to force the Phoenix Clan Champion Shiba Tsukune to side with the Hantei. In order to convince the Phoenix, the Hantei ordered to kill one of the children, who ended to be Isawa Yaruko, daughter of Taeruko and wife-to-be of Tsukune's son, Shiba Aikune.

This episode made Taeruko bear a grudge against Aikune during her whole life, as well as with Isawa Nakamuro, friend of Aikune who tried to save Yaruko too, for he was secretly in love with her. However, in her own soul Taeruko recognized the fact that she could never forgive Aikune and Nakamuro not because they failed to protect her daughter, but because as a Master of Earth one of her duties was to be an example of unyielding character and permanence for her people.

Tamori hatred
Taeruko was enraged with the deeds of the Dark Oracle of Fire, Agasha Tamori, against Phoenix. She blamed on Tamori's daughter, Tamori Shaitung, as well.

War of Fire and Snow
Ide Tadaji believed that, while Taeruko's hatred for Tamori Shaitung had not started the Dragon-Phoenix War, it certainly helped fuel it.

Taeruko's Sacrifice
Taeruko died during the Siege of Gisei Toshi, sacrificing herself to stop the immense oni Kusatte Iru.