On this panel, we see God L, one of the most important gods of Xibalba, facing Chan-Bahlum who appears across the doorway on the opposite panel.
"God L, one of the most important gods of Xibalba, has evidently guided Chan-Bahlum out of the Otherworld and back into the light of life. Finally, the text behind Chan-Bahlum on the Tablet of the Cross puts a period to the historical proceedings by recording the three-day-long dedication rites for the completion of this monumental group on July 23, 690.
God L is one of the aged gods who appear principally in scenes of Xibalba [the Underworld]. He is frail and bent with age, wrinkled in feature, and has a huge nose overlapping a toothless mouth. He is a smoker, preferring huge cigars or smaller cigarettes. His most important costume element is a headdress in the form of the mythological bird named Oxlahun Chan (13 Sky). He has a house in the Otherworld, where he is attended by the beautiful young goddesses who personify the number two. His rule of Xibalba is chronicled by a rabbit scribe. He is also the god who presided over the assemblage of gods when the cosmos was ordered on 4 Ahau 8 Cumku. "
Linda Schele & David Freidel, A Forest of Kings: The Untold Story of the Ancient Maya, p. 410-11.