Thiamine, also known as thiamin or vitamin B1, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent thiamine deficiency and disorders that result from it, including beriberi, Korsakoff's syndrome, and Korsakoff's psychosis. Other uses include maple syrup urine disease and Leigh's disease.
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All three have the same DPS. I find the Seer Staff to be the best due to the three attack rather than defense or utility in the crafting slots. The DPS is around 157 using dragon bone. Don't get caught up too much in the DPS number.