Underbase

"Mere possession [of the Underbase] brings madness... or death."

- Optimus Prime

Within each Transformer is a database, storage of that Transformer's accumulated knowledge. The Underbase is a "collection of knowledge that underlies all databases," or rather the combined knowledge of the Transformer race. It was curated by Boltax within his Temple of Knowledge, and it was considered off-limits to either Autobot or Decepticon.

Though acquiring portions of the Underbase can be enlightening, the combined power of its knowledge could damaging to Transformer microchips, causing madness or death.