Silence, you halfwit!
Percival Tachyon, ToD
The Cragmite Ruins were where the Lombaxes defeated the Cragmites. It was here that Tachyon used the Lombax Secret to bring back the Cragmites. It was also used as emperor Tachyon's base for operations. After being separated, Ratchet and Clank had to regroup, as well as fight Cragmites on the way back to each other.