Here's the fully grown Lava Snail! So far, this is the male, and since I don't have a female, this is all I got! I gotta say, I love these creatures!
Description for the creature is below!
Spoiler
Lava snails can grow to be quite large, the largest barely fitting into two hands. However, most stop growing at significantly smaller, easily nestling into an adult person’s palm. Strangely, they like to hoard gold like dragons do, and adults often have little stashes of gold they have come upon in their explorations. Magi bribe their snails to go on expeditions to cold places with gold, as lava snails do not particularly enjoy the cold. Being somewhat less fearsome than dragons, though, it’s not uncommon for their small hoards to get discovered and looted, so lava snails rarely have particularly large gold stashes. Adult lava snails molt the red gems on their shells every few years, which are too fragile to be used for jewelry, but retain a less potent version of their heating ability for a while. If a magi can’t bribe a lava snail to go somewhere cold with them, bringing some of the gems with them is usually an adequate if fragile substitute.