Have checked several times now and know have killed every headless one especially the times it says 10 and waiting on boss to spawn yet triumph says zero for everything so idk what's up also the upgrade ticket is a joke and idk why you would buy it bc they don't even give anything near as good as last event which wasn't great then
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You have 5 minutes to kill 10 then the boss spawns. The first shield 2 spawn. Then on second shield 3 spawn. Make sure you kill them all and none despawn.