The Covenant of Trattato di Sangue
The Covenant of Trattato di Sangue (The Treaty of Blood) is an alliance of four magi from different Houses, brought together by a shared sense of discontent. Or rather, three of them resent the current order of things, and the fourth is simply out to cause trouble.
The pact between them was sealed shortly after they met at the last Tribunal, so you may wish to foreshadow this story by briefly introducing some or all of the magi during a Tribunal before they make their fateful decision.
Their aims are simple — to take magical resources by right of conquest and then make such a show of force that the Tribunal cannot act against them. In fact, they do not intend to stop at just the four of them; they seek converts to their cause and to further strengthen their position.

