Time machine from
Chrono Trigger. At first only able to travel through
time until
Dalton, an overzealous emperor from
12000 BC steals it and puts wings on it, dubbing it his "
Aero Dalton Imperial". The machine then becomes a
transportation device for
4 dimensions (x, y, z, and t). In the end of the game the group is given the option of crashing into Lavos with the Epoch in order to make the final battle easier.
Also, the Epoch can be found, destroyed, in a secret room in
Viper's Manor in
Another World in
Chrono Cross, along with a name-changing creature that I think is meant to be a
Nu. Need a hint? Check the prophet's room.