Genshi Ryu is a boss creature confirmed to appear in Additional Creatures: Grand Hunt.
Genshi Ryu, known as The Primeval Dragon, is a species of elder dragon that is likely the largest creature confirmed for Additional Creatures so far, being quote "mountain-sized". They are geovores, who mostly feed on surrounding minerals. They are completely blind and are naturally docile. However, they destroy everything in their path as they walk, and are extremely powerful when provoked, creating high damage, knockback inducing roar attacks, along with a fury of other fast-blows. Due to their metal-based diet, they are extremely durable. Ingame, only 1 will appear in the world for a set amount of time before disappearing.