Very Informative post by Vú of Lightbriner, posted on wow-europe forums. This guide aims to help out players that are thinking to level a profession to help them in raiding. Most of this is well known to end game raiders, but i’m pretty sure that there are lots of players that will appreciate a guide like this.

Gathering Professions:

Mining gives a passive 60 Stamina Buff (Toughness),
Skinning gives 40 Critical Strike Rating (Master of Anatomy) and
Herbalism gives a Heal-over-Time spell which heals for 3600 HP with a 3 Minute Cooldown (Lifeblood).

Crafting Professions:

Each of the crafting professions give the player specific profession-only buffs, Blizzard has over the years managed to keep all of the professions pretty much in check so that no one profession outshines any of the others when it comes to buffs, however, some do have better advantages than others depending on your class.

This thread is aimed at raiding end-game players, and does therefore not list items or buffs that will not assist in this environment.

Alchemy:

Mixology is a passive ability which Alchemists will gain at Skill Level 50. Mixology grants the Alchemist boosted stats and duration from Flasks and Elixirs they are able to produce themselves (Mixology does not buff an elixir or flask effect if the Alchemist has not learned it already).

• The duration of the effect is always doubled (1 hour flasks last 2 hours for Alchemists with Mixology), but the effect boost differs on a case-by-case basis (from 30-50% extra depending on the flask/elixir)

In addition to Mixology, Grand Master Alchemists are able to create three Trinkets;

Indestructible Alchemist’s Stone: 75 Stamina, 50 Dodge Rating
Mercurial Alchemist Stone: 59 Spell Power, 50 Haste Rating
Mighty Alchemist’s Stone: 100 Attack Power: 50 Critical Strike Rating.

• In addition to their primary effects, each of the Alchemist’s Stones grant a 40% buff to all Mana or Healing potions used by the Alchemist. These trinkets are outclassed by most raid drops, but are good for leveling.

• Grand Master Alchemists with a skill of 400 or more can also create Endless Healing Potion, which heal for 1500-2500 HP, or Endless Mana Potion which restore 1800-3000 Mana on a shared 1 Minute Cooldown, they are not consumed when used.

• A recent introduction to Alchemy, Flask of the North can be created by an Alchemist with a skill of 400+ which grants 47 Spell Power, 80 Attack Power or 40 Strength for 1 Hour. Flask of the North is not consumed when used, but cannot stack with any other flask or elixir, and is unaffected by Mixology.

• Flask of the North can be used in Arenas.

Enchanting:

Enchanters get the option of 3 Enchanter-Only ring Enchants which are obtained at Skill Level 400. These are as follows;

Enchant Ring – Assault: 40 Attack Power
Enchant Ring – Greater Spellpower: 23 Spell Power
Enchant Ring – Stamina: 30 Stamina

When used on both ring slots, this gives the Enchanter up to a maximum of 80 Attack Power, 46 Spell Power or 60 Stamina extra, depending on which enchants are used.

Leatherworking:

Leatherworkers have 2 Leatherworking-only buffs. Leg Reinforcements and Fur Lining.

Jormungar Leg Reinforcements: 55 Stamina, 22 Agility
Nerubian Leg Reinforcements: 75 Attack Power, 22 Critical Strike Rating.

• Leg reinforcements offer the same benefits as the Epic leg armour (usable by everyone) but for a fraction of the cost.

• Because there is no spellpower leg enchant available to Leatherworkers, Spellpower users who level this profession are required to use the standard Tailor-made Spellthreads.

Fur Lining offers a huge increase in stats over the usual wrist enchants, they are as follows:

Fur Lining – Attack Power: 130 Attack Power
Fur Lining – Spell Power: 76 Spell Power
Fur Lining – Stamina: 102 Stamina.
Fur Lining – Resist: Increases your Arcane, Fire, Frost, Shadow or Nature resist by 70.

Tailoring:

Tailors are offered a choice of 3 Tailor-only cloak enchants, these are as follows:

Swordguard Embroidery :Sometimes increases your attack power by 400 for 15 seconds
Lightweave Embroidery: Sometimes increases your Spell Power by 295 for 15 seconds.
Darkglow Embroidery: Chance-on-cast to restore 400 Mana.

• Tailors can also create tailor-only spellweaves for the cost of one thread. These offer the same buffs as the standard spellweave leg enchants, but cost considerably less to craft.

Jewelcrafting

Jewelcrafters have the ability to gem their socketed items with up to 3 Jewelcrafter-only gems. These gems offer slightly better stats than the standard bind-on-equip gems.

[Bold Dragon's Eye]
[Bright Dragon's Eye]
[Brilliant Dragon's Eye]
[Delicate Dragon's Eye]
[Flashing Dragon's Eye]
[Fractured Dragon's Eye]
[Lustrous Dragon's Eye]
[Mystic Dragon's Eye]
[Precise Dragon's Eye]
[Quick Dragon's Eye]
[Rigid Dragon's Eye]
[Runed Dragon's Eye]
[Smooth Dragon's Eye]
[Solid Dragon's Eye]
[Sparkling Dragon's Eye]
[Stormy Dragon's Eye]
[Subtle Dragon's Eye]
[Thick Dragon's Eye]

Inscription

Scribers have the choice of one of four Inscription-only Shoulder enchants which offer superior stats to the Sons of Hodir shoulder inscriptions:

Master’s Inscription of the Axe: 120 Attack Power, 15 Critical Strike Rating
Master’s Inscription of the Crag: 70 Spellpower, 6 MP5
Master’s Inscription of the Storm: 70 Spellpower, 15 Critical Strike Rating
Master’s Inscription of the Pinnacle: 60 Dodge Rating, 15 Defense Rating

Blacksmithing

Blacksmiths have the ability to craft 2 additional sockets. One in Bracers and one in Gloves, allowing a potential of 2 extra gems over other professions.

Engineering

• Engineers have the ability to craft engineer-only head slot items from Skill level 400. These are excellent for leveling Engineers, but are outclassed by most level-80 head slot drops. Because of this I wont list them, but they can be found at the link below

http://www.wowwiki.com/Engineering#Wrath_of_the_Lich_King

Engineers are offered 3 glove enchants;

Hyperspeed Accelerators: 340 haste rating for 12 seconds (1 minute cooldown)
Hand-Mounted Pyro Rocket: 1654-2020 fire damage caused to enemy (45 second cooldown)
Reticulated Armor Webbing: 885 Armor

One boots enchant:

Nitro Boosts: 24 Critical Strike Rating, 5 Second run speed increase (3 minute cooldown)

and two cloak enchants:

Flexweave Underlay: 23 agility, 30 second slow-fall ability (1 minute cooldown)
Springy Arachnoweave: 27 spell power, 30 second slow-fall ability (1 minute cooldown)

• Engineers can also weave Saronite Bombs into their usual attack rotation.

• Saronite Bombs can be used once every minute and hit the target for an additional 1150-1500 fire damage, they are off the global cooldown so can be macro’d to another spell or ability. There DPS boost potential is small, but it is a boost.