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Chill of the Grave
This one lets your Chains of Ice, Howling Blast, Icy Touch, and Obilterate generate 5 additional Runic Power. This helps when your ability that fueled by Runic Power so it's a pretty decent grab and cheap to at only two ranks.
Deathchill
When activated it will make your next Icy Touch, Frost Strike, or Obliterate critical hit if used within 30 seconds and it has a 2 minute cooldown. For Frost DPS this is a talent that you're going to need and you're going to want to remember to use it as part of your rotation (it has no cost).
Improved Icy Talons
This is another weird talent. This one will make your Icy Talons increase the haste of your or raid by 20% for 20 seconds and will give you 5% passive haste. This one is a tough one to call, you should be this far into the tree and it's only one point. 5% haste is not a massive deal either. However, 20% haste for your entire raid/party is. I'd put the point in it even for PvP just to help your teammates in the Arenas/Battlegrounds and this is a no brainer for PvE.
Merciless Combat
This way this works is that when an enemy is below 35% health you will do an additional 12% damage with Icy Touch, Howling Blast, Obliterate, and Frost Strike. This talent can be skipped and you won't ruin your Death Knight with it but at the same time it's also a nice talent to have. In PvP this little bit of damage can help push your abilities far enough to decimate your enemy while in PvE this can help burn down enemies when they're low on health. Either way it's a great talent to have, but you won't break yourself not getting it.
Rime
Increases the critical strike chance of Icy Touch and Obliterate by 15% and casting Icy Touch will give a 15% chance to cause your next Howling Blast to consume no Runes. This talent is a must have for the 15% critical strike chance to two abilities you'll be using frequently.
Endless winter
Gives your Chains of Ice a 100% chance to cause Frost Fever and reduces its cost by 20 Runic Power. This one is a hard one to choose. Frost Fever should be giving you a ton of haste (if you're this deep into Frost) but at the same time it's not necessarily the best talent in the world. Grab it if you want the haste.
Howling Blast
Hopefully you've gotten Rime with this one. Howling Blast is a direct damage nuke that deals double damage to any enemy with Frost Fever, has a low cooldown, and has a home within your rotation. Be sure to get this if you're this far into Frost.
Frost Aura
Basically you will give all party/raid members within 45 yards spell resistance. Talk with your guild and see who needs this if anyone. It may be a complete waste of points if your guild doesn't need it and there is another Death Knight who has it.
Chilblains
Requires Endless Winter and snares 30% for 10 seconds on any target with Frost Fever. It's a good PvP talent but outside of that it has little use in PvE.
Blood of the North
Increases Blood Strike damage by 15% with a little extra added in by give you a 100% chance when you hit with Blood Strike or Pestilence that a Blood Rune will turn into a Death Rune when it activates. You'll want this ability because Death Runes are awesome, can do amazing things for your rotation, and 15% damage is even better.
Unbreakable Armor
At the cost of one Frost Rune you can get 25% armor, 10% strength, and 5% parry chance for 20 seconds every minute. For tanking this is a no-brainer. Anything other than PvE though and it may not be as awesome.
Acclimation
When you get hit by a spell you'll have a 30% chance to boost your resistance to that type of magic for 18 seconds and it can stack up to three times. The talent doesn't say, but the amount increased is 50. This is not a reliable talent so you can't depend on it, but it is helpful for any tank or in the battlegrounds.
