Frost-fire Mage Wonders

   Frost-fire Bolt is an interesting little spell. When you first hit level 75, visit your Mage trainer and learn it, you may think to yourself. Does it frost and fire damage? It's like a Fireball and a Frost-bolt combined.
At level 75, when you first obtain the spell, that's really about all it is a damage spell to use when running into a mob that's immune to your usual nuke. Frost-fire Bolt doesn't really hit its stride until you've hit level 80, talented specifically to get the most of the spell and started to get some of that sweet Naxxramas gear.
   Frost-fire Bolt is a nuke that has a three-second cast time that can't be talented down. It has a fixed 40 yard range which can't be talented down. It doesn't do fire damage and frost damage but does frost-fire damage. Currently there are no resistances or immunities that specifically affect this type of damage, apart from general, across-the-board spell damage reductions. When determining partial resists, the lower of the two resistances such as fire or frost on your target will be used to determine the mount of frost-fire damage resisted. There were points in the Wrath beta where the spell would switch damage types, which depend on the mob's resistances–doing fire damage to some, frost to others–but this is no longer the case. It is now always frost-fire.
   Forst-fire Bolt must be effectively talented around with an elementalist build. In general, these come in two flavors like a deep Fire build or a deep Frost one. The Frost-heavy one has sub-par damage but some Mages like it because it allows them some PvP utility and gives them access to their Water Elemental. For pure damage potential, a Fire-heavy build is the only way to go. If done correctly, the raw damage output of a Frost-fire build will outperform every other Mage spec at the current endgame. It is the highest DPS raiding build out there.
   You will want to begin each encounter by fully applying the Improved Scorch debug and then use a very simple rotation when raiding with a Fire-heavy elementalist build. Once you've cast your five Frostfire Bolts, you'll recast Living Bomb so its DoT can run its course and sandwich in the occasional Scorch to keep that debuff up. When Hot Streak procs, you'll want to use it for a Scorch–Pyroblast combo, since that's the most effective way to keep your Improved Scorch debuff up without messing up your rotation too much.
   It isn't the most interesting rotation in the world, but it will outdamage just about anything else out there. You can set up a macro that keeps your trinkets and longer cool-down talents such as Combustion and Icy Veins in the mix, and let the Frost-fire fly.
   What stats are most important to a raiding frost-fire Mage? Hit rating is still king but once that is capped out, the order goes something like this: spell-power, crit, haste and everything else. Crit and haste are actually very close for this build's purposes, and their order could switch well, which depend on your gear and current stat levels. Both are incredibly important to have solid amounts of to get the most out of your Frost-fire build, as haste rating is the only way to lower that 3-second cast-time, and so much of your damage and procs are so heavily crit-dependent that you really have to have a decent crit rating.

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