The key of chaos is one of the keys believed to be lost in the great war, it holds considerable power that could shift the balance of the world if it falls into the wrong hands and he had to take that possibility out of the equation.
Mihir knew the threat this key possessed better than anyone here, this key had the power to destroy the world but this was not in the brief meaning that Botho and the rest were not even aware of this artifact. Mihir was glad he stayed his hand or this revelation would have never happened.
If they were, it would be treated with far more urgency. Mihir smiled for he was going to get that key, by all means, possible because all Mihir ever wanted in this lifetime was even more power.
A power that was now before him, the bidding war began and it was the most intense.