Gouka Dragon
this immense reptile was native to the deserts of the planet Aargonar. It spent most of its life underground, tunnelling through the sand and rock to avoid the heat of the desert. These reptiles were known to feed on the sarlaccs that grew on Aargonar, attacking them from underground and avoiding their tentacles. For those beings lucky enough to encounter a gouka dragon and survive, they returned to report that they saw very little of the gouka itself. The beast filled the tunnels it created, so that it appeared only as a huge mouth when it attacked. The mouth glowed with a strange, green light, which resulted from a combination of bioluminescence and the churning digestive fires that filled its belly. The gouka generated an intense amount of body heat, which was only increased by the friction of its passage through rocks and sand. This heat literally melted the rock through which it moved, giving gouka tunnels smooth, rounded sides.