Jackson disappearance

It had been two days since Optimus regained his memory when a group of unknown creatures attacked Arcee in the middle of one of her patrols. Hours after the fight Jack disappears without a trace, with only a single clue as to what was happening: UNITY,. DUTY, DESTINY.

Just what is Jack hiding and why? What does it mean for the war? and who are this strange group of warriors who fought like a well oiled machine?

(AN: don't own Bionicle or Transformers Prime)