Great Thunderbugs are small bugs that are in the Neopteron family, alongside Vespoid's and Hornetaur's. They glow a bright blue when calm, or a menacing red when angered. When a Thunderbug spots an enemy it will float towards the target, shocking it with the electrical field around its body. Despite the attack doing little damage, there is a chance that the attack will paralyze you (similar to a vespoid sting) for a few seconds.
Great Thunderbugs can drop rare items in the form of a shiny when killed. For example, High Rank thunderbugs drop Thunderbug Juice, an item that can be used to craft the famous Devil Slicer. Like other monsters, they drop different items on G-rank quests.
Thunderbugs are found in: