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Under Morrighan's orders, Bella plotted to overthrow the Aliech Kingdom. She convinced Shakespeare to assassinate Morrighan, who was actually King Ethur Mac Cuill the Second. Shocked, Shakespeare immediately tried to flee with Bella, but she stops him and apologizes. Just then, Lugh stabs Shakespeare from behind, "killing" him; Bella apologizes once again. Lugh then considers Bella as Triona and demands the throne of Aliech Kingdom.
After Cichol saves Shakespeare from Morrighan's grasp, the god reveals that Bella is the Emissary of Destruction, a rival to the Milletian's Brionac, the Emissary of Creation. She has the ability to control and corrupt the minds of others; Lugh and Tara's citizens were brainwashed by Bella into thinking her as Triona and denying Eirawen the throne so Lugh can rule the Aliech Kingdom. Cichol tasks Shakespeare to create the Sphere of Truth in order to form the Truth Helm, which allows him to resist Bella's mind control.
Later, when the Milletian spies on Lugh and Bella, Lugh reveals his plot to his "daughter" true ultimate goal was to rid the world of all living beings, leaving her full of regret. After Lugh leaves, Bella immediately uncovers the Milletian, stating they cannot hide from her. She then asks what Shakespeare foresaw, and is more regretful if they tell her about the future consisting of her massacring Milletians. However, she does not divulge any details, and then knocks them out where they awaken in the Scathach Caverns.
When Eirawen leads the assault to overthrow Lugh, he is driven to insanity; he realizes that Bella is not Triona, and kills her. In her dying breath, she apologizes for her unforgivable actions, which she claims was done in order to protect Erinn. She gives Shakespeare her notebook and says good bye; the souls from the deceased gather which are all sacrificed along with Bella to purify the Soul Stream.
Morrighan reveals to have ordered the Emissary of Destruction to sacrifice herself, which angers Shakespeare, stating she has no right to speak Bella's name nor mourn her.