Under the chair

We bring Abernard back to the tower and meet up. Teach him, Dune and Fijit about using the transportation tokens.
Accidentally find a secret tunnel under the liches chair. Head down to check it out.
Turns out Roddimus Prime and his buddies are down in a giant electrical level, fighting the evil Primals for control of the Door to The Sleeper.
Crazy tech/magic everywhere, and my teleportation is supressed
What/who is the Sleeper? Unknown.
We are deciding if we will help them. Door covered in Azlanti symbols we cannot yet read. Has a lock, need to examine it and see if we know what the key is, because no stone unturned.
Some bizarred unhinged mouth creature crouches on the roof and stares at us. Prime says it is telepathic.
Prime prepares to fight, will we help?