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Immersive Patrols places a Stormcloaks vs. Imperials battle at Pinefrost Tower.
Bellyache's New Dragon Species places an Ebony Bulldrake at Pinefrost Tower.
Dragon Combat Overhaul gives dragons the ability to call for up to three reinforcement dragons.
Enhanced Mighty Dragons and Deadly Dragons add new dragon species.

Mix all five, and this is what happens. Was an insanely epic battle! :D

Fun fact: I haven't even started the MQ yet beyond triggering Alduin.