Builds/Elemental Master

Elemental Master is the 4th job of the Sorcerer (Sage → Sorcerer → Elemental Master). It casts large elemental ground spells and summons powerful 4th-job spirits that boost those spells. It usually fights with a book for Magic Book Mastery.

These builds are advice, based on how skills are calculated on WeeklyRO. They are a good starting point, not the only way to play. Skill formulas can change with server updates. Stat and skill resets are cheap at the Reset Girl, so feel free to experiment.

At a glance

Role	Area magic damage (Water, Earth, Fire, Wind, Poison, Neutral)
Weapons	Book (Magic Book Mastery only works with one); staves and rods also fine
Main stats (3rd job)	INT, DEX, VIT
Main traits (4th job)	SPL, then STA / WIS
Difficulty	Medium (spirits need setting up)

Key 4th-job skills

All numbers are at max skill level and are multiplied by your base level / 100.

Skill	Type	What it's for	Scales with
Diamond Storm / Terra Drive	Magic, Water / Earth	9×9 ground blast, 1 s cooldown, gives 5 AP. 15,600%, or 21,600% while Diluvio / Terremotus is summoned	SPL (+7% per SPL, +10% with the spirit), base level
Conflagration / Lightning Land / Venom Swamp	Magic, Fire / Wind / Poison	9×9 area that keeps hitting for 3 s, gives 5 AP. 6,200% per hit (+1,000% with Ardor / Procella / Serpens)	SPL (+5% per SPL, +2% more with the spirit), base level
Psychic Stream	Magic, Neutral	Jumps you next to the target and hits a 7×7 area 5 times for 21,000% each. 2 s cooldown, costs 5 AP	SPL (+12% per SPL per hit), base level
Elemental Buster	Magic, your spirit's element	13×13 blast around you, 27,050% (+1,500% vs Formless and Dragon race). Costs 15 AP, needs a 4th-job spirit	SPL (+10% per SPL), base level
Summon Elemental Ardor / Diluvio / Procella / Terremotus / Serpens	Summon	Upgrades your level-3 Sorcerer spirit into a 4th-job spirit for 25 minutes; +10% magic damage of its element	–
Magic Book Mastery	Passive	With a book: +1% Water, Earth, Fire, Wind and Poison magic damage per level	–
Spell Enchanting	Party buff	+4 S.MATK per level (+20 at level 5)	–

How the spirits work: each Summon Elemental skill only works while the matching level-3 Sorcerer spirit is out (Summon Water Spirit Aqua level 3 for Diluvio, Earth Spirit Tera for Terremotus, Fire Spirit Agni for Ardor, Wind Spirit Ventus for Procella). Serpens (Poison) can be made from any of the four. Each summon uses one Ice / Earth / Flame / Wind / Poison Stone 4th, sold for 1,000 Zeny by the Point Merchant (Prontera prt_in 131,66, and in most other towns). Elemental Spirit Mastery makes these spirits much tougher.

Prerequisites: the ground spells need Magic Book Mastery 2. Psychic Stream needs Magic Book Mastery 5 and all five ground spells at level 3. Elemental Buster needs Elemental Spirit Mastery 5 and all five summons. You get one skill point per job level (59 by job level 60).

Build: Diamond Storm / Terra Drive (leveling)

For solo and party leveling from base 200.

Stats: INT 130, DEX 120–130, VIT 80–100, the rest in AGI or LUK. Variable cast time reaches zero when DEX × 2 + INT (with bonuses) reaches 530; these spells keep a 1.5 s fixed cast.
Traits: First ~45 points (base 210): all SPL. Every 3 SPL is +1% magic damage and every SPL adds 7–12% to your main spells. Next ~40 (base 220): SPL to about 80, then STA and WIS for survival. Later: SPL to 110. Your job level also gives +12 SPL, +8 STA, +8 WIS and +6 CON at max job level.
Skills to max first: Magic Book Mastery 10, Diamond Storm 5, Terra Drive 5, Elemental Spirit Mastery 1, Summon Elemental Diluvio, Summon Elemental Terremotus, then Conflagration, Lightning Land and Venom Swamp to 3 for Psychic Stream 5 (37 points). After that: Elemental Spirit Mastery 5, the other three summons and Elemental Buster 10. Spell Enchanting takes the last points.
Playing it: Summon Diluvio or Terremotus (whichever element the map is weak to), then spam Diamond Storm or Terra Drive on groups. Each cast gives 5 AP, which pays for Psychic Stream and Elemental Buster. On Fire maps use Diamond Storm; on Wind maps use Terra Drive.

Build: Psychic Stream (bosses and Neutral maps)

Same stats and traits. Psychic Stream does 5 × 21,000% (+60% per SPL in total), the highest damage of any Elemental Master skill, and it is Neutral, so it does full damage to everything except Ghost monsters. Use it whenever you have 5 AP. Elemental Buster (15 AP) is your big area finisher. Note that Psychic Stream moves you next to the target, so be careful near dangerous monsters.

Before 4th job (base 99–200)

As a Sorcerer, level with Diamond Dust (Water) and Earth Grave (Earth). Their damage is 2 × INT + 300% per level of Endow Tsunami / Endow Quake + INT × skill level, so at INT 130 with the Endow at level 5 they do 2,410% (times base level / 100). Psychic Wave (Neutral, 350% + 3% per INT per hit) is your backup for Neutral monsters, but its cast time is long. Go INT 130 and DEX as high as you can. Before 4th job, get Spirit Sympathy 1 and the four level-3 spirit summons, because the 4th-job summons need them.

Tips

Match elements. In Lost Farm Valley use Diamond Storm (Water) on Red Pitaya (Fire), Terra Drive (Earth) on Yellow Pitaya (Wind) and Lightning Land (Wind) on Blue Pitaya (Water). See the Leveling Guide for monster elements.
Tartaros Storage and Rudus have many Neutral monsters: Psychic Stream and Venom Swamp (Poison) both do full damage to Neutral.
Buy a stack of 4th stones before leaving town; summons last 25 minutes with a 60 s cooldown.
Diamond Storm and Terra Drive have a small chance to inflict Frostbite or Crystallization on targets.
Stat and skill resets at the Reset Girl cost only 5,000 Zeny each.