I have everything but obsidian mind and skull of dire ahamkara for warlock.
I would rather use sunbreakers, claws of ahamkara, or light beyond nemesis.
I haven't seriously used praxic since I got light beyond nemesis.
Praxic' effect is only any good if you're using radiance for DPS, which I don't, I use it for survivability.
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It is not mediocre if you use it for its purpose.