Dark magic

The chimera is created by dark magic. It is kind of poetic that you are going to fight it with dark magic too. There are several options to use your powers. You could try to use your dark magic to force the chimera under your control. One thing you did in the classroom was to drain the lifeforce of an opponent. You tested it with rats, but it should weaken the monster until it dies. However, instead of taking life, you could use your own energy to give life to something else around you and create a golem. This is not easy, partly dangerous and you have nothing prepared, but you should be able to do it for a short amount of time witout bigger problems.