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Job Base: Alchemist
Job Type: 2-2 Transcendent
Changes At: Juno
Number of Skills: 4
Total Skill Points: 27
Total Quest Skills: 0
Job Bonuses
+4 +6 +3 +7 +14 +11



With knowledge comes understanding, and with understanding comes mastery. The Biochemist's unyielding dedication to research and experimentation have raised them to the summit of scientific knowledge. Now that their proficiency with potions and chemicals is unmatched, they are on the verge of manipulating the very laws of nature!

Biochemists are a much stronger class than the Alchemists, provided there are sufficient funds and SP for the new skill Acid Bomb (often abbreviated to "AB" or "AD" as it is known as Acid Demonstration on some other official servers.). While Alchemists were more of a melee class, Biochemists tend to level with skills other than Cart Revolution and Mammonite. Many invest a great amount of their stat ponts into INT and level with Acid Bomb or magic attacks from weapons (i.e. Fire Bolt through the weapon Fireblend) and Homunculi instead.

Biochemists are a popular class in iRO because of the amount of damage they can deal, along with the current lack of methods to counter their offensive skills, when they are used properly.

Jobchange Guide

Biochemist classchange 0.gif

To become a Biochemist, you must find a book called 'the Book of Ymir' in 'Sage Castle', Juno. The book will lead you to Valhalla so you can change your job through the Biochemist job NPC. Also you must reach at least job level 40 as a transcendent 1st class character.

Trans classchange 1.gif Trans classchange 2.gif
1.Sage Castle is located at 11 o'clock direction (yuno 88,320) in Juno. 2.'Book of Ymir' is located inside a room behind an NPC called Metheus Sylphe (yuno_in02 88,164).
Trans classchange 3.gif Biochemist classchange 4.gif
3.The Book of Ymir (yuno_in02 94,206) will teleport you to Valhalla. 4.Find and talk to a job NPC suited to your 2nd class.

  • Note: After becoming a Biochemist, if the player knew Bioethics in their prior life, they can regain it by speaking to the Job Change NPC in Valhalla a second time.



  • STR: 1
  • AGI: 25 (base)
  • VIT: 1
  • INT: 99 (base)
  • DEX: 99 (base, but do NOT exceed 149 DEX)
  • LUK: 1

The defacto build for a WoE Biochemist, this build makes use of the easy access to Stun Immunity through gear. The 1 VIT makes it virtually immune to Acid Bomb from other Biochemists, making it a strong character on a guilds front line. Their weakness is Magic and Dispel, but any Biochemist should be constantly under the effect of Devotion.

Skills: Acid Bomb, Potion Research, Full Chemical Protection

Aid Condensed Potion

  • STR: 1
  • AGI: * (all remaining points)
  • VIT: 97-100 (total)
  • INT: 1
  • DEX: 99 (base, but do not exceed 149 DEX)
  • LUK: 1

A central and necessary support character, these Biochemists have one job: spam Aid Condensed Potion. At level 10, this skill will heal everyone in a 7x7 area for a large amount of HP (based off of their VIT, skills and buffs). Many guilds rely on two or three of these characters to keep them alive.

Skills: Aid Condensed Potion, Potion Research, Full Chemical Protection

Potter (MC)

  • STR: 1
  • AGI: 1
  • VIT: 1
  • INT: 94-99 (base)
  • DEX: 36 (base)
  • LUK: 94-99 (base)

A Biochemist built for Prepare Potion should be built for Marionette Control to maximize the success rate. Getting 99 base INT rather than DEX can be preferable as it boosts Acid Bomb damage considerably and lowers the Prepare Potion success rate by only ~0.25%.



Acid Bomb, while expensive, can yield extremely high EXP in dungeons such as Thors Volcano and Biolabs 3. Having a priest Lex Aeterna monsters will help reduce the cost of leveling this way. Sword Guardians in Thors 3 can be killed easily with Acid Bomb and a high level priest as early as you get Acid Bomb 10, as you should have maxed your INT already.


The cost of Acid Bomb is overcome by the zeny gained from MVPing while solo or in small parties. A Biochemist will usually beat the competition on almost any MVP. With enough VIT, it's possible to solo MVPs that most people have trouble tanking.


Acid Bomb will one-shot a considerable amount of players in PvP, aside from GR wearers, near everyone will die in two Acid Bombs.


A Biochemist is an exceptional front line class, as Acid Bomb tickles them. Biochemists using Aid Condensed Potion need to position themselves properly to heal as many people as possible while staying out of Acid Bomb range, as they are VIT heavy.


A Biochemist built for Acid Bomb should aim for equipment that adds INT or, sometimes, that gives a significant amount of DEX. However, these equipments are a general guide. Note that these gears are not intended for Aid Condensed Potion Biochemists.

5225.png Parade Hat

for Stun-Resistance, carded with a Stalactite Golem Card for stun resistance.

5123.png Ulle's Cap

for DEX, carded with a Stalactite Golem Card for stun resistance. This hat requires the use of a Mega Resist Potion for stun immunity.

2202.png Sunglasses [1]

carded with a Stalactite Golem Card for stun resistance.

5574.png Well-Chewed Pencil

for DEX.

2357.png Valkyrian Armor

, enchanted with DEX if possible, carded with an Evil Druid Card for INT and immunity to Sleep and Stone.

13414.png Elemental Sword

carded with three Cecil Damon Cards for ASPD.

2115.png Valkyrja's Shield

carded with a Thara Frog Card for Demi-Human Resistance.

2538.png Captain's Manteau

carded with either a Raydric Card for Neutral Resist or a Noxious Card for Neutral and Ranged resistance.

2435.png Battle Greave

carded with a Matyr Card for AGI and HP.

2701.png Orlean's Glove

carded with a Zerom Card for DEX, or a Smokie Card for the skill Hiding. A Glove[1] is a cost-efficient substitute, at the cost of 1 DEX.

Class Data


Below are listed the skills that are unique to the Biochemist class. For more information about Alchemist skills, click here.

Skill Description Levels Type
Acid Bomb.png Acid Bomb
Consume 1 Bottle Grenade and 1 Acid Bottle to hurl the contents of both items at a targeted enemy to inflict an amount of damage affected by this skill's level, the caster's INT, and the target's VIT. 10 Offensive
Aid Condensed Potion.png Aid Condensed Potion
Uses a condensed potion to heal all of the caster's party members, guild, or an allied guild within a 7x7 cell area around a targeted spot. Level affects color of potion used. 10 Supportive
Cultivate Plant.png Cultivate Plant
Attempt to create a random type of Mushroom (Lv.1) or Plant (Lv.2) with a 50% success rate. Disabled in WoE. 2 Active
Full Chemical Protection.png Full Chemical Protection
Protects the armor, weapon, helmet and shield of a party member from being damaged or stripped for the skill's duration. 5 Supportive

Unimplemented Skills

Alchemy.png Alchemy
Potion Synthesis.png Potion Synthesis

Job Bonuses

Stat\Amount +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12 +13 +14
STR 6 31 53 66
AGI 5 18 27 38 54 67
VIT 9 33 61
INT 7 13 22 30 46 59 68
DEX 1 10 15 23 35 41 42 43 47 49 56 57 63 70
LUK 3 8 20 25 34 45 51 52 60 64 69


External Links

Alchemist & Biochemist
2nd Class
Acid Terror • Aid Berserk Potion • Aid Potion • Alchemical Weapon • Axe Mastery • Biochemical Helm • Bomb • Potion Research • Prepare Potion • Spiritual Potion Creation (variant 1) • Spiritual Potion Creation (variant 2) • Spiritual Potion Creation (variant 3) • Summon Flora • Summon Marine Sphere • Synthesized Shield • Synthetic Armor
Bioethics • Biotechnology • Call Homunculus • Creature Creation • Cultivation • Drillmaster • Flame Control • Heal Homunculus • Homunculus Resurrection • Vaporize
Acid Bomb • Aid Condensed Potion • Alchemy • Cultivate Plant • Full Chemical Protection • Potion Synthesis
Quests Alchemist Job Change Guide • Alchemist Skill Quest • Rebirth Walkthrough
Weapons Axe • Dagger • Mace • One Handed Sword
Classes of Ragnarok Online
Novice Class Novice • High Novice • Super Novice
First Class Acolyte • Archer • High First Class • Magician • Merchant • Swordman • Thief
Second Class Priest • Monk • Hunter • Bard • Dancer • Wizard • Sage • Blacksmith • Alchemist • Knight • Crusader • Assassin • Rogue
Transcendent Second Class High Priest • Champion • Sniper • Minstrel • Gypsy • High Wizard • Scholar • Mastersmith • Biochemist • Lord Knight • Paladin • Assassin Cross • Stalker
Expanded Class Gunslinger • Ninja • TaeKwon Kid • TaeKwon Master • Soul Linker