Mod edit: I took the liberty of editing the first post and turn it into an information post (Mihir)
Symbiosis
30 yd range. 6 sec cast.
Creates a symbiotic link which grants the Druid one ability belonging to the target's class, varying by the Druid's specialization.
In exchange, grants the target one Druid ability based on their class and combat role.
Lasts 60 min and persists through death. Cannot be cast on other Druids. Effect cancelled if Druid and target become too far apart.
Also according to http://us.battle.net/wow/en/forum/to...4?page=23#450: "Symbiosis cannot be cast in combat." So we're stuck with a certain symbiosis per fight, can't switch halfway.
Update: After some testing, found it also can't be cast on a target that's in combat.
All classes except druid will get the following spell in their spellbook (unknown at what level):
Symbiosis
When Symbiosis is cast on you by a Druid, this button will be replaced by the new ability you have temporarily learned.
UPDATE: The generic Symbiosis spell doesn't appear in your spellbook; it's a placeholder ability on your actionbars if you had put a real symbiosis ability there and then lost the symbiosis.
BOLD abilities are CONFIRMED
Updated 12-7-'12
Abilities that are granted by Symbiosis:
Death Knight
Blood - Might of Ursoc (15%)
Frost / Unholy - Wild Mushroom: Plague
Hunter
Dash
Mage
Healing Touch (10s cd)
Monk
Brewmaster - Survival Instincts (25%/6s)
Windwalker - Bear Hug (was Berserk)
Mistwalker - Entangling Roots
Paladin
Holy - Rebirth
Retribution - Wrath (was Tiger's Fury)
Protection - Barkskin (10%/6s)
Priest
Discipline / Holy - Cyclone
Shadow - Tranquility (usable in shadowform)
Rogue
Growl
Shaman
Elemental / Enhancement - Solar Beam
Resto - Prowl
Warlock
Rejuvenation
Warrior
Arms / Fury - Stampeding Shout (was Enrage)
Protection - Savage Defense (2min cd) (was Frenzied Regeneration (1min cd))
Balance
Death Knight - Anti-Magic Shell
Hunter - Misdirection
Mage - Mirror Image
Monk - Grapple Weapon
Paladin - Hammer of Justice
Priest - Mass Dispel
Rogue - Cloak of Shadows
Shaman - Purge
Warlock - Unending Resolve (was Soulshatter)
Warrior - Intervene (was Recklessness)
Feral
Death Knight - Death Coil (was Unholy Frenzy)
Hunter - Play Dead
Mage - Frost Nova
Monk - Clash
Paladin - Divine Shield
Priest - Dispersion
Rogue - Redirect
Shaman - Feral Spirit
Warlock - Soul Swap
Warrior - Shattering Blow
Guardian
Death Knight - Bone Shield (10%/3 charges) (was Chains of Ice)
Hunter - Ice Trap
Mage - Frost Armor
Monk - Elusive Brew (10%/8s/60s cd)
Paladin - Consecration
Priest - Fear Ward
Rogue - Feint (10%) (was Smoke Bomb)
Shaman - Lightning Shield
Warlock - Life Tap (20% health/30 rage/15s cd) (was Twilight Ward)
Warrior - Spell Reflection
Resto
Death Knight - Icebound Fortitude
Hunter - Deterrence
Mage - Ice Block
Monk - Fortifying Brew
Paladin - Cleanse (was Hand of Sacrifice)
Priest - Leap of Faith
Rogue - Evasion
Shaman - Spiritwalker's Grace
Warlock - Demonic Circle: Teleport
Warrior - Intimidating Roar