Final answer:
Cilissa in 'The Libation Bearers' embodies loyalty and cunning, altering the queen's orders and enabling Orestes to achieve his vengeance, thus impacting the drama's themes and plot.
Step-by-step explanation:
The character of Cilissa in The Libation Bearers contributes significantly to the themes and the plot of the drama. Cilissa demonstrates a theme of loyalty through her devotion to Orestes and Agamemnon, and she aids in the deception of Clytemnestra, effectively building the suspense that culminates in the play's resolution.
Furthermore, her actions directly contribute to the advancement of the plot; by cleverly altering Clytemnestra's orders, she ensures Aigisthos meets Orestes alone, allowing him to enact his revenge. Cilissa's brief role serves not only to challenge Clytemnestra's claim to motherhood but also to exert influence on the outcome of the events, reflecting the power of loyalty and cunning over deceit and treachery within the play's themes.