Enhancing
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Regular enhancements can be bought from the Game Menu's Enhancement shops.
Awe enhancements can be bought from Valencia at /museum after obtaining the Blade of Awe.
See below for what enhancements each class should use. One thing to remember is that if you're in a group with crit-boosting supports, it's better to use Awe Blast (or Mana Vamp) over Spiral Carve.
SpC: Spiral Carve
AB: Awe Blast
HV: Health Vamp
MV: Mana Vamp
Lucky
Abyssal Angel SpC
Abyssal Angel’s Shadow SpC
Alpha DOOMmega MV
Alpha Omega MV
Alpha Pirate MV
Arachnomancer MV/AB
ArchFiend SpC/HV
ArchPaladin SpC
Artifact Hunter SpC
Assassin SpC
Barber HV
Bard AB
Beast Warrior MV/HV
BeastMaster SpC
Berserker SpC
Beta Berserker SpC
BladeMaster SpC
BladeMaster Assassin SpC
Blood Ancient MV
Blood Titan SpC/HV
CardClasher SpC
Chaos Avenger AB
Chaos Avenger Member Preview SpC
Chaos Champion Prime SpC
Chaos Shaper MV
Chaos Slayer SpC
Chrono Assassin AB
Chrono Chaorruptor SpC
Chrono Commandant SpC
ChronoCommander SpC
ChronoCorrupter SpC
Chronomancer AB/MV/HV
Chronomancer Prime AB/MV/HV
Chunin SpC
Classic Alpha Pirate SpC
Classic Barber SpC
Classic Defender MV
Classic DoomKnight SpC
Classic DragonLord HV
Classic Exalted Soul Cleaver SpC
Classic Guardian SpC/HV
Classic Legion DoomKnight SpC
Classic Paladin SpC
Classic Pirate SpC
Classic Soul Cleaver SpC
ClawSuit MV
Continuum Chronomancer SpC
Corrupted Chronomancer SpC
Cryomancer Mini Pet Coming Soon MV/HV
Dark Chaos Berserker SpC
Dark Harbinger SpC
Dark Legendary Hero SpC
Dark Metal Necro AB
Dark Ultra OmniNight MV
DeathKnight Lord AB
DoomKnight SpC
DoomKnight OverLord MV
Dragon Shinobi AB
Dragonlord AB
Dragonslayer HV
Dragonslayer General MV
DragonSoul Shinobi AB
Drakel Warlord MV
Empyrean Chronomancer SpC
Enchanted Vampire Lord HV
Enforcer HV
Eternal Chronomancer SpC
Eternal Inversionist SpC/HV
Evolved Dark Caster SpC
Evolved ClawSuit SpC
Evolved Leprechaun MV/HV
Evolved Pumpkin Lord AB
Exalted Harbinger SpC
Exalted Soul Cleaver SpC
Flame Dragon Warrior HV
Glacial Berserker AB
Glacial Berserker Test MV/HV
Glacial Warlord SpC
Great Thief SpC
Grunge Rocker AB
Guardian AB
Heavy Metal Necro AB
Heavy Metal Rockstar AB
Heroic Naval Commander MV
Horc Evader MV
Immortal Chronomancer SpC
Imperial Chunin SpC
Infinite Dark Caster SpC
Infinite Legion Dark Caster SpC
Infinity Titan SpC
Legendary Elemental Warrior MV
Legendary Hero SpC
Legendary Naval Commander MV
Legion BladeMaster Assassin SpC
Legion DoomKnight SpC
Legion DoomKnight Tester MV/HV
Legion Evolved Dark Caster SpC
Legion Revenant Member Test MV/HV
Legion SwordMaster Assassin SpC
Leprechaun SpC/AB
Lord of Order AB
Lycan SpC
Master Ranger SpC
MechaJouster MV/SpC
Naval Commander MV
Nechronomancer AB/HV
Necromancer SpC
Necrotic Chronomancer AB/HV
Ninja MV
Ninja Warrior SpC
NOT A MOD SpC
Nu Metal Necro AB
Oracle AB
Overworld Chronomancer SpC
Paladin MV
Paladin High Lord MV
PaladinSlayer MV
Pinkomancer SpC
Pirate MV
Prismatic ClawSuit SpC
ProtoSartorium HV
Pumpkin Lord MV/HV
Ranger SpC
Renegade SpC
Rogue SpC
Royal Vampire Lord HV
Rustbucket HV
Scarlet Sorceress SpC
Sentinel HV
Shadow Dragon Shinobi AB
Shadow Ripper AB
Shadow Rocker AB
ShadowFlame DragonLord MV
ShadowScythe General SpC
ShadowStalker of Time AB/MV
ShadowWalker of Time AB/MV
ShadowWeaver of Time AB/MV
Silver Paladin MV
SkyCharged Grenadier SpC
SkyGuard Grenadier SpC
Soul Cleaver SpC
Star Captain AB
StarLord SpC
StoneCrusher SpC
SwordMaster SpC
SwordMaster Assassin SpC
Thief of Hours MV
TimeKeeper SpC
TimeKiller SpC
Timeless Chronomancer SpC
Troubador of Love AB
Ultra Elemental Warrior MV
Ultra OmniKnight MV
Unchained Rocker AB
Unchained Rockstar AB
Undead Goat SpC
Undead Leperchaun SpC
UndeadSlayer SpC
Underworld Chronomancer SpC
Unlucky Leperchaun SpC
Vampire HV
Vampire Lord HV
Void Highlord SpC/AB
Void Highlord Tester MV/HV
Warlord MV/HV
Warrior MV/HV
WarriorScythe General MV/HV
Yami no Ronin AB
Wizard
Acolyte AB
Arcane Dark Caster AB
BattleMage MV/AB
BattleMage of Love MV/AB
Blaze Binder AB
Blood Sorceress AB
Chrono DataKnight SpC
Chrono DragonKnight SpC
Cryomancer SpC
Daimon MV
Dark BattleMage MV/AB
Dark Caster SpC
Dark Cryomancer SpC/MV
Dark Lord SpC
Dark Master of Moglins AB
Darkblood StormKing SpC
Darkside SpC
Defender SpC
Dragon Knight AB
Elemental Dracomancer SpC
Evolved Shaman MV
FireLord Summoner AB
Frost SpiritReaver SpC
Grim Necromancer AB
Healer AB
HighSeas Commander AB
Immortal Dark Caster SpC
Infinity Knight AB
Interstellar Knight AB
Legion Paladin SpC
Legion Revenant SpC/AB
LightCaster SpC/AB
LightCaster Test HV
LightMage MV
Love Caster HV
Mage HV
Master of Moglins AB
MindBreaker MV
Mystical Dark Caster AB
Northlands Monk SpC/AB
Pink Romancer SpC
Psionic MindBreaker SpC
Pyromancer SpC
Royal BattleMage MV/AB
Sakura Cryomancer SpC/MV
Shaman MV
Sorcerer HV
The Collector HV
Timeless Dark Caster AB
Troll Spellsmith SpC
Vindicator of They MV
Witch AB
Fighter
DeathKnight AB
Frostval Barbarian AB
Healer
Dragon of Time - Farming: HV, Soloing: AB
This class can also use Wizard.