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Magic Defense?
It doesn't really repeat itself; "helps channel" and "provides benefits to" are related, but not the same thing. If it were referring to magic defense, it would not say "benefits to"; adding those two words makes the statement too broad to refer to a single stat, and magic def is the opposite of a benefit to magic.
The first line of the description is just filler/flavor text. The second line says 2 things; 1:It provides benefits to magic, 2:It provides physical defense.
Next time you have trouble with the wording of something, please come to the talk page first instead of starting a revert war with 3 people.