Teras Fe Tys

The Teras Fe Tys (テラス・フェ・テュス, Terasu Fe Teyusu) is the penultimate boss of Genso Suikoden Tsumugareshi Hyakunen no Toki. It is fought twice, 200 and 100 years ago, in the lead up to the final boss battle.

Information
An enormous Teras Pharma propagating as part of the 300-year-old Era Tree at the heart of the Yggdrasilian Palace, Renefarious would combine with the Teras Fe Tys in HIY 300, becoming seemingly unstoppable in his attempt to crush the 108 Stars once and for all.

However, both 100 and 200 years ago, parties led by Thorwad Albreck and Astrid respectively, would breach the Yggdrasilian Palace and fight the Teras Fe Tys there. Defeating it in both time periods weakened it enough that the hero's Company in the present day were able to fight and defeat Holy Emperor Renefarious.

Both Astrid's party (Radnin, Lethe, Kiaro, Rodric, Maximus Zaphir, and Fridika) and Thorwad's (himself, Rolf Laug, Mui, Beaga, Badamhatan, and Heidrake) should have little difficulty overcoming the Teras Fe Tys, though the weaker skills used by Thorwad's group may prove slightly bothersome.

Trivia

 * Its name stems from the English (and ultimately Latin) word "fetus", befitting its incubatory nature.