Annihilation at any cost including personal destruction is characteristic of what stage of conflict escalation?

Question

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The "together into the abyss" stage of conflict escalation is characterized by a willingness to endure self-destruction if it means the opponent is also destroyed. This stage represents the extreme end of conflict escalation where the parties involved are so entrenched in their opposition to each other that they are willing to accept mutual annihilation.

Annihilation at Any Cost Including Personal Destruction Is Characteristic of What