Crystal Sage Staff - Global Network
Crystal spheres devour the will of the user, and this staff increases the potency of sorceries at the cost of increased fp consumption for skills. Boosts the strength of sorceries for a very short. The buffed crystal staff hits a little bit harder than the court sorcerer, but unbuffed it does much less.
Understanding the Context
Imo, just use the sorcerer as the damage difference is too small. Use the court sourcerer. Sage eats ashen estus. Crystal sage's staff doesn't cost any more fp than anything else, only the wa does.
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Key Insights
Considering you need to use that to deal better damage and the duration of. Weapons reinforced with regular titanite are listed at +0, +3, +6, and +10 as those reinforcement increments represent the base damage of the weapon and the top tier of each. I'd have personally said that a pure spell caster would want court sorcerer staff over the sage's crystal staff, due to needing as much fp efficiency as possible.