The Voracidous fight is only available once the main quest of the Hammerlock DLC has been completed, and takes place in Candlerakk's Crag.
- Bullets of all kinds. Shield killing weapons are of great importance.
When you call Voracidous into the arena it will be joined by Chief Ngwatu. The important thing to note is that during this first stage, Voracidous has no shield, but the Chief does. Half way through the fight the chief is doing to give Voracidous his remaining shield, and power Voracidous up, so task number one is to chip away at Ngwatu's shield as much as possible before turning your full attentions to Voracidous.
As for Voracidous, watch out for his ranged spike attack. If the beast launches these into the arena then you need to run away from them, as the blast from them is very damaging.
Two possible drops include the Interfacer shotgun, or the Hawk Eye sniper rifle.