Camelot castle holds many surprises, which are discussed in this guide. The biggest surprise is that approximately a minute after Tarasque is slain, Administrator DeValos spawns.
(Screenshot courtesy of Chrisax, President of Athen Paladins, RK-2)
Administrator DeValos will loudly proclaim his annoyance and then start attacking everyone in the room. Having been lulled into a false sense of security by how easy it was to kill Tarasque, you will find Administrator DeValos to be more formidable. He hits for approximately 5K melee and poison damage with 10K crits.