Time Controls, but you still have to use one of every Time Control to defeat it. For some odd reason, the Chronohorn tries to suck you and Time Crystals in with an organic tube, and getting sucked in usually means death. Oh, and it can also make the entire coliseum slippery if the "ice bombs" explode. It's all as difficult as it sounds, and not a single LPer had fond memories of fighting it.