Mages: Buff / Debuff: Arcane Intellect (Buff): Inreases the target Intellect by 60 points. The raid wide version it's called Arcane Brillance and requires Arcane Powder. This does not stack with
Fel Intelligence even that it provides les intellect (because of the spirit buff)
Focus Magic (Buff): Increases the target's chance to critically hit with spells by 3%. When the target critically hits the caster's chance to critically hit with spells is increased. You need to invest 11p in the Arcane tree to obtain this. If you have 2 mages with this is is DPS wise to exchange Focus Magic between them. This only affects Casters!
Enduring Winter (Buff): Requires 40 points in the frost tree and having the talent "Summon Water Elemental". It haves 3 ranks. your Frostbolt spell has a 33/66/100% chance to grant the Replenishment effect to up to 10 party or raid members mana regeneration equal to 0.25% of their maximum mana per second for 15 sec.
Improved Scorch (Debuff): Increases the raid chance to critically hit with spells by 1% and stacks up to 5 times, each time the mage cast a scorch on the target one stack of the debuff is applied. With the glyph it only need to be casted 1 time to apply the 5 stacks (The mage need to spend 16 points in the fire tree to improve the Scorch spell and give this effect)
Winter's chill (Debuff): The frost version of Improved Scorch, it works a bit different. This talent have 3 ranks increasing the and each time a frost spell lands on the target there is a 33/66/100% chance to apply one stack (Stacks 5 times too) increasing 1% crit each stack.
Threath reduction:
Each tree has it's own talent to reduce threat caused.
Arcane Subtlety: Reduce up to 40% of arcane threat
Burning Soul: Reduce up to 10% of fire threat
Frost Channeling: Reduce up to 10% of frost threat
Aditionally, there are 2 abilities to dump aggro.
Invisibility: Fades the caster to invisibility over 3 sec, reducing threat each second. If the mage recibes any damage or if it cast a spell this is cancelled. Each second of the fade reduces by a %. Once it reachs the invisibility the treath on all thargets is reseted.
Mirror Image: Creates 3 copies of the caster nearby. This spell instantly reset aggro on all enemies.
Survivality:
Mages are one of the most fragiles casters on the game. They wear cloth and have low HP compared to Warlocks for example and they do not heal themselfs. That said. They have quite amaizing survavility abilities for PVE.
Ice Block: This spell makes the mage inmmune to all harmfull efects. They cannot cast any spell or move during the effect and last 10 seconds.
If a mages get the aggro this is the ability they tend to use. Note that this do not reset the agro so all mobs should be picked befor the effect goes away if you are planing to keep the mage alive.
Blink: Teleports the caster 20 yards forward (5 more if glyphed, but it's not very common). This is an instant cast and it's very usefull for going away very quick from AOE's like razorscale fire. 15 seconds cooldown.
Magic Absorption: (Arcane tier 2 talent) Increases all resistances by 1 per level on rank 2. This is mostly a PVP talent but it can be usefull to keep the mages alive on heavy spell AOE fights