I've been doing triumphs for the tribute hall in order to get the Bad Juju catalyst. For the triumph 'Final Exam', you need to complete Leviathan encounters using Calus themed weapons and armour. However, I am getting 0 progress in this quest whilst farming encounters in the Prestige Leviathan raid. Specifically, I'm farming the dogs encounter whilst wearing a full set of Leviathan armor, Bad Juju and the Beloved sniper rifle, but no progress is granted to the 'Final Exam' triumph.