I have adjudication tomorrow. Documents state the onus is on the employer to prove their case for firing me? I have no witnesses or evidence to give beyond my own testimony. Am I without hope?

Hello,

Unfortunately without knowing anything about your case or seeing any of the employer's evidence we cannot give you much insight as what will happen at the adjudication. However, you are correct in that it is the employer's onus to justify your termination if they alleged cause for terminating you.