The Emperor must be approached to start the ring event ending in Vindicator Crush. He will talk, then four 35 ▲ D'Vinnian guardians spawn and attack you. He will talk some more, then Crush walks into the room as an NPC. Halfway to the throne Crush becomes a 35▲▲▲ mob and attacks you. Assuming you defeat Crush, the Emperor says some more nasty things and teleports away.