How do you get the radagon icon?

Steam Community :: Guide :: All Legendary Item Locations Needed for Achievements

Radagon's icon talisman states it shortens casting time. By adding 30 virtual dexterity it supposedly does what it states, but how much quicker are we talking? 2%? 4%? it seems like a waste of a valuable talisman slot in my current setup. Is it even worth it? : r

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