The Council was known as the most powerful faction, but the truth was that the relationship between the member clans was unstable.
The Emperor's and Dragon Emperor's clans had a minor clash recently. The two emperors did not participate. Nonetheless, it was evident how the Dragon Clan easily outpowered The Emperor's clan. The result ended with the Dragon Clan successfully forcing The Emperor's clan to retreat. Both sides did not suffer heavy casualties, but the damage done was nothing to scoff at.
The damage dealt in that clash did not affect the two clans' military strength per se. Instead, it was their reputation.
Discussions started circulating about how The Dragon Emperor's clan was far superior to The Emperor's clan. The discussion only happened between clan leaders and their trusted aides, but this was precisely what caused The Council's instability to worsen.