Class Guide ~ Shaman

Healer build

Medical Specialization: 15 (Each Lv, G-Healing +1%)
Supernatural Lore: 15 (Each Lv, Cast SPD +1%)
Scrying Knowledge: 10 (Each Lv, WIS +1%. Requires Medical Specialization Lv 10)

Improve buff build

Medical Specialization: 10 (Each Lv, G-Healing +1%)
Supernatural Lore: 15 (Each Lv, Cast SPD +1%)
Scrying Knowledge: 3 (Each Lv, WIS +1%. Requires Medical Specialization Lv 10)
Natural Science: 10 (Each Lv, Element resistance +1%)
Harvest: 1 (Each Lv, Earth Energy's STR & INT bonus+20%. Requires 20 knowledge points & Natural Science Lv 10)
Caning Knowledge: 5 (Each Lv, Max MP +2%. Requires 30 knowledge points)
Hunting Ritual: 1 (Each Lv, Marks of Wind's AGI & LUK bonus +20%. Requires 35 knowledge points & Carving Knowledge Lv 5)

Damage & Critical build

Ancient Knowledge: 15 (Each Lv, INT +1%)
Astrology: 15 (Each Lv, M-Crit Rate +1%)
Geology: 10 (Each Lv, M-Crit DMG +2%)

Speed caster build

Supernatural Lore: 20 (Each Lv, Cast SPD +1%)
Ancient Knowledge: 15 (Each Lv, INT +1%)

~ I hope it will be useful!