Tarnation and CTP should be guaranteed deepsight drops after the fix, I can´t imagine this quest step was ever intended to take more than a week.
Nobody even wants to craft these weapons, they will be instantly dismantled when the quest step is done.
Mindlessly grinding the same activity over and over has become the most boring waste of time this game has to offer for me.
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i dunno about "guaranteed" since nothing in life but death and taxes are guaranteed, but i know they added a higher RNG, and bad luck protection. If you want to talk about mindless grinding, the worst was the one we did during shadowkeep to resurrect" rasputin