I had a thought about Lucius, perhaps he serves a Tyrant and him blowing up the GG and nearly killing all the other masters was him clearing the way for his Tyrant friend. Also now we know that manifesting your avatar is basically turning tyrant for a time, making it permanent turns you into a Tyrant so every master has the potential to become the next batch of Tyrants. All the more reason Lucius would want them all dead if he already served a Tyrant, that or he is a bureaucratic version of the Joker and wants to watch the world burn.