Thunderbug's Carapace is a heavy armor set. When you take Physical Damage, you have a 50% chance to deal 5160 Shock Damage in a 5 meter radius around you. This effect can occur once every 3 seconds.
Thunderbug's Carapace is part of the base game and drops in Malabal Tor in the Overland content. You can also find it on Guild Traders. Each set item is bound on equip. You can acquire heavy armor, jewelry and weapons for this set in the Primal motif style.