The number one rule for casters is ALWAYS BE CASTING. This means you want to fill your global cooldowns with abilities always, even an "incorrect" rotational ability is more damage than no ability, with respect to mana of course.
Frost Mage dumps mana to do damage via:
Frostbolt: Single target ability, spammable.
Ice Lance: Single target ability, Ideally use against frozen enemy targets in a
Frost Nova or a
Frostbite. Or if
Fingers of Frost procs.
Fire Blast Single target ability only used when you have nothing else and cannot cast.
Blizzard: Main AoE ability, channeled, so use when safe.
Cone of Cold +
Arcane Explosion: AoE ability, use when you can't channel Blizzard, or to finish off many mobs.
Frost Blast: Weaker Frostbolt used to slow enemies.
Arcane Missiles: Single target ability, use when proc'd by
Missile Barrage.
Conjure Mana Agate: Or other similar mana gems to restore mana.
Evocation: To restore mana if no gems or potions available.
Single Target Rotation Priority:
- Maintain
Ice Barrier if possible as it increases your damage by 3% - When
Fingers of Frost procs, cancel your current spell and
Ice Lance the buff off, this is because
Frostbolt will consume
Fingers of Frost and you prefer to have
Ice Lance consume it. - When
Frostbite procs if they are rootable, use
Ice Lance after your next
Frostbolt as they will hit the Frostbited nova at the same time and both benefit from
Shatter. - When
Missile Barrage procs use
Arcane Missiles. - Spam
Frostbolt till step 2 or 3 or 4 happens. - If you have to move your character cause of a mechanic or kiting and do not have a
Fingers of Frost available, cast
Fire Blast to just fill the global cooldown or other instant casts. - If you are OOM (out of mana) look to restore your mana with various mana gems like
Conjure Mana Agate or other mana gems, potions like
Mana Potion, or
Evocation. - Use your Wand.
The goal of this spec is to spam
Frostbolt's until either step 2 or 3 happens and then you try to hit big
Ice Lance's, use
Missile Barrage when safe to cast it, and careful as not all enemies can be frozen by
Frostbite namely boss enemies.
AoE Rotation Priority:
- Maintain
Ice Barrier if possible as it increases your damage by 3% - If it is safe Precast a
Flamestrike, but be weary as this is insanely high aggro against your tanks. - If you can cast always cast
Blizzard hitting as many targets as possible. - If you cannot hard cast then start spamming between
Cone of Cold and
Arcane Explosion. - Spend
Fingers of Frost +
Ice Lance procs for movement. - If you are OOM (out of mana) look to restore your mana with various mana gems like
Conjure Mana Agate or other stronger gems, potions like
Mana Potion, or
Evocation. - Use your Wand.
Frost mage AoE is pretty much just use blizzard if you are safe to channel it, and if you are not safe you use
Cone of Cold and
Arcane Explosion instead.
You can try the
Frost Nova ->
Flamestrike ->
Cone of Cold combo that the AoE farming build talks about for big
Shatter burst on AoE content as well just be weary that in dungeon content when others are hitting the
Frost Nova it is likely to break and not get the benefits of
Shatter.