we can focus at crown but the 2 dungeon weapons need 5 deepsight and they cannot be focused, purely rng.
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Honestly I think 5 is fine for the regular season activities but I will agree on drops for the dungeon. The other night me and a couple clan mates were farming for stormchaser and 2 of us got armor 5 times in a row. Couldn't imagine trying to grind out for the 2 craftables.