Cotys uses Arius's life and succession rights as leverage.
Cotys threatens Arius, described as the true heir to the throne, in order to control Ergenia.
Ergenia's opposition to Cotys is closely tied to Arius's safety.
Ergenia is distressed by Cotys's threat against Arius, while Arius is identified as the true heir whom she wants to protect.
Autolycus directly protects the threatened heir.
During the climactic battle, Arius is taken hostage and Autolycus returns to rescue him.
Tydeus gives his life to keep Arius alive during the final battle.
Tydeus is mortally wounded while protecting Arius, yet continues fighting until he dies in Hercules's arms.
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