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High level casters don't directly fight each other. Seriously they don't. Especially high level arcane casters, because they have learned over the years the one true tactic that allowed them to become high level. Cowardice.
In truth when high level casters have disagreements they sit down to coffee/tea/lunch each brings a plan with various offensive options and defensive options, discuss them with each other and then mutually declare a winner and walk away alive perhaps with new insight in magical tactics. If that isn't enough they fight proxy wars through adventurers, constructs, undead, dominated minions, or have the fight while in astral projection. Anything that would avoid getting your soul trapped or utterly consumed leaving your backup mortality plan in jeopardy.