Ayudando a mejorar esta información:
http://www.l2fea.es/foros/index.php?topic=15815.0Para adquirir la bonificación de las subclases es necesario realizar la siguiente quest, la cual inicia en hardin's private academy .
El NPC Hardin nos envía a hablar con un Master en Hunter Village
Ahora tendremos que matar fantasmas ubicados en la zona de forest mirrors
Una vez conseguidos los 35 items necesarios, regresamos a Hunter village
Terminando de hablar con el NPC de hunter Villeage nos dirigimos a hardin's private academy.
Entender que las quest son dar vueltas y vueltas, ahora tenemos que ir a Dion.
Ahora iremos a la guild de los elfos oscuros con el master Clayton, nos encargara matar glass jaguar, los cuales se encuentran en plains Dion.
Una vez recolectados los ítems tendremos que volver con el Master.
Al terminar de hablar con el Master Clayton, nos envía a hardin's private academy a hablar con Hardin, esta es la última etapa de la quest. Al terminar de hablar con el NPC Hardin nos entregara un scroll de transformación, anteriormente se aprendía directamente, pero ahora iremos a Ivory Tower para aprender la transformación y las bonificaciones de las subclases. 
Es todo por ahora, contamos con lo necesario para recoger los certificados de las subclases, recuerda que para adquirir los certificados es con la clase base.A continuación se muestran las bonificaciones de cada subclase, espero sea útil la información.Warrior (Destro, BH, Tyrant, Glad, Warlord, SB, BZ)
Passive Greater CP Boost: +738 cp 
Passive Resist Debuff (paralyse, hold, sleep, shock, cancel debuffs) +5% 
Active Chance Haste: +33% atk speed, 15 sec, 1% trigger rate per swing (out of 45951 hits only 461 procs)
Single Weapon Hits Per second = Attack Speed / 500
Dual Weapon Hits Per second = (Attack Speed * 2) / 500Rogue (Dagger/Archer, Arb)
Passive Long Shot: +200 bow range 
Passive Boost Evasion: +4 evasion
Active Chance Critical: +30% crit rate, 15 sec, 1% trigger rate per swing (out of 45951 hits only 459 procs)Knight (Pally, DA, TK, SK)
Passive Greater HP Boost: +6% 
Passive Resist Critical Damage: +3% reduction 
Active Counter Boost Mdef/Pdef: +20%m/pdef, 15 sec Summoner (Warkock, PS, ES)
Passive Boost HP/MP: +147 HP / +74 MP 
Passive Resist Elements: +5 resist 
Active Boost M.Atk/P.atk, casteo/Speed Atack, 15 sec Nuker (SH, SpS, Sorc, Necro)
Passive Boost Magic Resist: +5% Magic Resist Rate 
Passive Boost Recharge Rate: +20 mp per recharge 
Active Counter Mana Vampire: 10 mp, 3% chance (17mp w/mana gain passive)
Cuando Atacas, recuperas tu mp. Healer (SE, EE, Bish)
Passive Increase Self Healing: +19 HP on heals 
Passive Resist Divine Elements: +5 resist 
A
ctive Counter Self Heal: +183 HP, 3% chance
Chance de recuperar Hp en algún golpe.Enchanter (PP, WC, BD, SwS, Inspector)
Passive Greater MP Boost: +148 MP 
Passive Boost MP Regeneration: +0.5 MP/tick 
Active Counter Invunerability: 5 sec, 3% chance
Great Physical Defence (+29 p.def)
Great Magic Defence (+50 m.def)
Great Physical Offence (+? p.atk)
Great Magic Offence (+29 m.atk)
Critical Rate (+30 critical)
Magic Casting (+11 cast.spd)
For EACH subclass you get to level 75 in the following category you can learn one of the following skills.
Summoner Class (Warlock, ES, PS, Necro)
Summoner Ability - Boost HP/MP : increases Max. HP and Max. MP
Summoner Ability - Defense Expert : increases PDef. and MDef.
Summoner Ability - Spirit : When you get hit, you get possessed by a soul at certain chance.
Summoner Ability - Resist Attribute : increases resistances to elemental attributes
Healer Class (SE, EE, Bishop)
Healer Ability - Casting Speed Up : increases Magic Casting Speed.
Healer Ability - Prayer : increases his recovery effect from healing spells. lvl1 effect.
Healer Ability - Defense Expert : increases PDef. and MDef.
Healer Ability - Heal : when you get hit, you recover your HP at certain chance.
Warrior Class (Glad, Warlord, Dwarves, Tyrant, Destroyer)
Warrior Ability - Might : increases PAtk.
Warrior Ability - Critical Chance : increases Critical Chance.
Warrior Ability - Haste : when you attack, increases attack speed at certain chance.
Warrior Ability - Defense Expert : increases PDef. and MDef.
Knight Class (All Tanks and BD/SWS)
Knight Ability - Boost HP : increases Max. HP.
Knight Ability - Resist Trait : increases resistances to paralyse, hold, sleep, shock, cancel debuffs.
Knight Ability - Defense : when you get hit, your defense increases at certain chance.
Knight Ability - Defense Expert : increases PDef. and MDef.
Enchanter Class (Heirophant, Doom Cryer)
Enchanter Ability - Boost Mana
Enchanter Ability - Mana Recovery
Enchanter Ability - Barrier : when you get hit, you become invincible temporarily at certain chance.
Enchanter Ability - Defense Expert : increases PDef. and MDef.
Rogue Class (All Archers and Daggers)
Rogue Ability - Evasion
Rogue Ability - Long Shot
Rogue Ability - Critical Chance : when you attack, critical chance increases at certain chance.
Rogue Ability - Defense Expert : increases PDef. and MDef.
Wizard Class (Archmage/Mystic Muse/Storm Screamer)
Wizard Ability - Empower
Wizard Ability - Mana Gain
Wizard Ability - Mana Steal :when you attack, recovers your MP at certain chance.
Wizard Ability - Defense Expert : increases PDef. and MDef.
Transformaciones solo si la subclase es terminada en nivel 80.Transform Divine Warrior
Transform Divine Knight
Transorm Divine Wizard
Transorm Divine Enchanter
Transorm Divine Healer
Transorm Divine Summoner
Transorm Divine Rogue
Nota.- No sabía que ya existía una guía de la quest de transformaciones, al terminar mi guía y enterarme, ya había invertido tiempo y dedicación por lo que decidí no omitirla, espero que igual les sea útil.