- The Pit — A location within Unicron where unfortunate Transformers have their bodies burned away and painfully re-built so they may serve his purposes. The Pit broadly resembles an early script concept of Galvatron's recreation in The Transformers: The Movie (1986), which later actually appeared in Marvel UK.
- The Pit — A location analogous to Hell in both Maximal and Predacon many Cybertronian belief systems. The Pit myth is probably based on the location inside Unicron, though Transformers are often ignorant of the Unicron connection. The Inferno (associated myth, see comments) is said to be extremely dark.
- The Pit — A Predacon facility used to bring life to protoforms. Located on Cybertron. Apparently named for the Pit myth above.
- "By the Pit!" / "By the Inferno!" — A Predacon exclamatory invective. It was first used by ? and refers to the Pit myth above. See Comments section below for the connection between the two.
While outlining the Beast Wars cartoon, Bob Forward and Larry DiTillio created the made-up curse "By the Inferno" so the bad guys could swear. This was changed to 'the Pit' to avoid confusion when the Predacon Inferno was added to the cast. Having given the Matrix a position analogous to Heaven, they made the Inferno/Pitt their Hell.
The BW series bible included two facilities that created protoforms, the Matrix and the Pit (names reflecting the heaven/hell dynamic.) These were never mentioned in the series (possibly it was a stand-in concept in case they ever 'needed to answer' to where protoforms came from.) However, 10 years later (2007) the protoform facilities were made canon by a club-exclusive story... despite the canon now having several other sources of protoforms.
The 2004 Universe introduced the Pit within Unicron. It also introduced the idea that there is only 1 Unicron across all continuities, so the Pit myth would retroactively be about this version of the Pit (probably,) which even includes its own fiery inferno! A connection to/inspiration by the early version Galvatron's reformatting has never been confirmed, and is pure speculation.
- The exclamation could also refer to the Pit facility, viewed strictly from a canon standpoint, but it was originally written as the Hell-analog.