Solved Chanter's stats ?

Why chanter have Magic boost stat ?
few damages are magic, is it useless ?

Does stun activation depend of Magic acc or accurancy ?

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IIRC Magic Boost affects Blessing of Wind, Infernal Blaze and Promise of Earth.
Chanter stuns depends on both magical accuracy and accuracy by this way. Your physical attack needs to hit (meaning it should not be evaded), once it hits, the stun effect of the skill will depend on magical accuracy. Stuns like Infernal Blaze however depends solely on magical accuracy since the skill itself is a magical attack skill.