Ren also bought a [Tortobas] when he found that Florin was selling one. Tortobas were rare species of giant tortoise that had the ability to grow plants on their shells.
They could grow depending on the amount of food they ate. Their adult size could range from one meter to fifty meters over the course of time.
Some even ended up growing an entire ecosystem on their backs. Since their shells were curbed at the edges, when it rained and when they dived, they could carry hundreds of liters of water, fish, and aquatic ecosystems with them, creating artificial lakes around the shells, which, thanked to their rooting properties, could allow aquatic plants to survive.
Ren could acquire one in lakes, but he didn't want to go through the trouble of doing it. If he could save time by buying the items he needed, then the better.
