Stealth (Final Fantasy XI)

Stealth is gained by Ninjas at Level 5. It lowers the chance of being detected by enemies. It seems to function the same as the Ranger's Alertness.

Final Fantasy XI abilities

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Bard	Clarion Call - Critical Defense Bonus - Fencer - Marcato - Nightingale - Pianissimo - Requiem - Resist Silence - Soul Voice - Troubadour - Tenuto
Beastmaster	Amorph Killer - Aquan Killer - Beast Affinity - Beast Healer - Bird Killer - Call Beast - Charm - Familiar - Fencer - Feral Howl - Fight - Gauge - Heel - Killer Instinct - Leave - Lizard Killer - Plantoid Killer - Ready - Resist Amnesia - Resist Slow - Reward - Run Wild - Sic - Spur - Stay - Stout Servant - Tame - Unleash - Vermin Killer - Wide Scan
Black Mage	Clear Mind - Conserve MP - Elemental Celerity - Elemental Seal - Enmity Douse - Magic Attack Bonus - Magic Burst Bonus - Manafont - Manawell - Mana Wall - Occult Acumen - Subtle Sorcery
Blue Mage	Assimilation - Azure Lore - Burst Affinity - Chain Affinity - Convergence - Diffusion - Efflux - Enchainment - Unbridled Learning - Unbridled Wisdom
Corsair	Cutting Cards - Double-Up - Fold - Loaded Deck - Phantom Roll - Quick Draw - Random Deal - Rapid Shot - Resist Amnesia - Resist Paralyze - Snake Eye - Triple Shot - True Shot - Wild Card - Winning Streak
Dancer	Closed Position - Conserve TP - Critical Attack Bonus - Dual Wield - Evasion Bonus - Fan Dance - Flourish - Grand Pas - Jig - Presto - Resist Slow - Saber Dance - Samba - Skillchain Bonus - Step - Subtle Blow - Tactical Parry - Trance - Waltz
Dark Knight	Arcana Killer - Arcane Circle - Arcane Crest - Attack Bonus - Blood Weapon - Critical Attack Bonus - Desperate Blows - Last Resort - Muted Soul - Nether Void - Occult Acumen - Scarlet Delirium - Soul Eater - Soul Enslavement - Tactical Parry - Weapon Bash - Consume Mana
Dragoon	Accuracy Bonus - Ancient Circle - Angon - Attack Bonus - Call Wyvern - Conserve TP - Critical Attack Bonus - Critical Defense Bonus - Deep Breathing - Dragon Breaker - Dragon Killer - Empathy - Fly High - High Jump - Jump - Restoring Breath - Smiting Breath - Soul Jump - Spirit Link - Spirit Jump - Spirit Surge - Steady Wing - Strafe - Super Jump
Geomancer	Blaze of Glory - Bolster - Cardinal Chant - Clear Mind - Collimated Fervor - Concentric Pulse - Conserve MP - Curative Recantation - Dematerialize - Ecliptic Attrition - Elemental Celerity - Full Circle - Lasting Emanation - Life Cycle - Max MP Boost - Mending Halation - Primordial Zeal - Radial Arcana - Theurgic Focus - Widened Compass
Monk	Boost - Chakra - Chi Blast - Counter - Counterstance - Dodge - Focus - Footwork - Formless Strikes - Hundred Fists - Impetus - Inner Strength - Invigorate - Kick Attacks - Mantra - Martial Arts - Max HP Boost - Penance - Perfect Counter - Skillchain Bonus - Subtle Blow - Tactical Guard
Ninja	Dual Wield - Futae - Innin - Issekigan - Magic Burst Bonus - Mijin Gakure - Mikage - Ninja Tool Expertise - Resist Bind - Sange - Skillchain Bonus - Stealth - Subtle Blow - Tactical Parry - Yonin
Paladin	Auto Refresh - Chivalry - Critical Defense Bonus - Cover - Defense Bonus - Divine Emblem - Fealty - Guardian - Holy Circle - Intervene - Invincible - Iron Will - Palisade - Rampart - Resist Sleep - Sentinel - Sepulcher - Shield Bash - Shield Defense Bonus - Shield Mastery - Undead Killer
Puppetmaster	Activate - Cooldown - Critical Defense Bonus - Evasion Bonus - Fine-Tuning - Heady Artifice - Martial Arts - Optimization - Overdrive - Repair - Resist Amnesia - Resist Slow - Role Reversal - Stout Servant - Tactical Guard - Tactical Switch - Ventriloquy
Ranger	Accuracy Bonus - Alertness - Barrage - Bounty Shot - Camouflage - Conserve TP - Dead Aim - Decoy Shot - Double Shot - Eagle Eye Shot - Flashy Shot - Overkill - Rapid Shot - Recycle - Resist Poison - Scavenge - Shadowbind - Sharpshot - Snapshot - Stealth Shot - True Shot - Unlimited Shot - Velocity Shot - Wide Scan
Red Mage	Chainspell - Clear Mind - Composure - Convert - Fast Cast - Magic Attack Bonus - Magic Burst Bonus - Magic Defense Bonus - Resist Petrify - Saboteur - Shield Mastery - Spontaneity - Stymie
Rune Fencer	Auto Regen - Elemental Sforzo - Embolden - Flabra - Gambit - Gelus - Ignis - Inquartata - Liement - Lunge - Lux - Magic Defense Bonus - Odyllic Subterfuge - One For All - Pflug - Sulpor - Swordplay - Tactical Parry - Tellus - Tenacity - Tenebrae - Unda - Valiance - Vallation
Samurai	Blade Bash - Demon Circle - Demon Killer - Hagakure - Hamanoha - Hasso - Ikishoten - Meditate - Meikyo Shisui - Overwhelm - Resist Blind - Seigan - Sekkanoki - Sengikori - Shikikoyo - Skillchain Bonus - Store TP - Third Eye - Yaegasumi - Zanshin
Scholar	Addendum: Black - Addendum: White - Caper Emissarius - Clear Mind - Conserve MP - Dark Arts - Enlightenment - Libra - Light Arts - Magic Burst Bonus - Max MP Boost - Modus Veritas - Occult Acumen - Resist Silence - Stormsurge - Strategems - Sublimation - Tabula Rasa
Summoner	Astral Conduit - Astral Flow - Assault - Auto Refresh - Avatar's Favor - Blood Boon - Blood Pact: Rage - Blood Pact: Ward - Clear Mind - Elemental Siphon - Mana Cede - Max MP Boost - Release - Resist Slow - Retreat - Stout Servant
Thief	Accomplice - Ambush - Assassin - Assassin's Charge - Aura Steal - Bully - Collaborator - Conspirator - Critical Attack Bonus - Despoil Dual Wield - Evasion Bonus - Feint - Flee - Gilfinder - Hide - Larceny - Mug - Perfect Dodge - Resist Gravity - Sneak Attack - Steal - Treasure Hunter - Trick Attack - Triple Attack
Warrior	Aggressive Aim - Aggressor - Attack Bonus - Berserk - Blood Rage - Brazen Rush - Critical Attack Bonus - Defender - Defense Bonus - Double Attack - Fencer - Mighty Strikes - Resist Virus - Restraint - Retaliation - Provoke - Savagery - Shield Defense Bonus - Shield Mastery - Tomahawk - Warcry - Warrior's Charge
White Mage	Afflatus Misery - Afflatus Solace - Asylum - Auto Regen - Benediction - Clear Mind - Devotion - Divine Benison - Divine Caress - Divine Seal - Divine Veil - Martyr - Magic Defense Bonus - Sacrosanctity - Shield Defense Bonus - Tranquil Heart