Class Guide ~ Magician

Balanced build

Elemental Mechanics: 10 (Each Lv, M-Crit DMG +2%)
Tongue Twister: 15 (Each Lv, Cast SPD +1%)
Black Magic: 15 (Each Lv, M-Crit Rate +1%)

Extra note: Max Tongue Twister first for fast cast speed, more attacks and leveling will be faster. Then Black Magic for more critical rates followed by Elemental Mechanics for more critical damage done. Recommended for players who like fast cast speed, damage & critical damage.

Critical build

Tongue Twister: 15 (Each Lv, Cast SPD +1%)
Black Magic: 20 (Each Lv, M-Crit Rate +1%)

Extra note: Recommended for players who like to see high damage with critical hits while not neglecting cast speed.

Speed caster build

Tongue Twister: 20 (Each Lv, Cast SPD +1%)
Black Magic: 15 (Each Lv, M-Crit Rate +1%)

Maximizing Stable Damage

Staff Master: 17 (Each Lv, P-ATK and M-ATK +1% when equip with staff)
Tongue Twister: 18 (Each Lv, Cast SPD +1%)

Extra note: Magician characteristic: Staff Expert which adds P-ATK and M-ATK+10% when equip with staff, along with 15 points on Staff Master, total them up and it will be a whopping 25% increase of P-ATK and M-ATK when equip with a staff. Do take note that 25% increase of P-ATK and M-ATK is from the staff itself not from the entire stats of the character. Also players of this build will not be able to do critical hits as often as the other builds above. Recommended for players who wants a stable damage as well as to maximize their M-ATK but also not neglecting cast speed.

~ I hope it will be useful!