Demonology
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Improved Healthstone – 2 ranks.
Increases the amount of health restored by your healthstone by 10 – 20%.
If you’re chugging healthstones a lot, this talent is ok. It’s nothing great, but it has extra value in that one player can carry a regular healthstone, a rank 1 improved and a rank 2 improved. This can be beneficial in raids, for longer fights.
Improved Imp – 3 ranks.
Increases the effect of your Imp’s Firebolt, Fire Shield and Blood Pact spells by 10 – 30%
The extra stamina from Blood Pact, coupled with the 30% more damage output (should you be inclined to use your imp for damage) makes this talent worthwhile.
Demonic Embrace – 5 ranks.
Increases your total stamina by 3 – 15% but lowers your spirit by 1 – 5%.
A 5% reduction in spirit for a 15% increase in hitpoints is a very good tradeoff. This is easily the best tier 1 talent we have. Note that it effects the total stamina, so that goes for sta provided by items and buffs too.

Improved Health funnel – 2 ranks.
Increases the amount of health transferred by your Health Funnel spell by 10 – 20%. Reduces the health cost by 10-20%
This talent is not really great, but its helpful to get your pet back up to full health a little faster without having to resort to bandages.
Improved Voidwalker – 3 ranks.
Increases the effectiveness of your Voidwalker’s Torment, Consume Shadows, Sacrifice and Suffering spells by 10 – 30%.
The 30% better taunt gives your voidwalker a much easier time maintaining aggro. Sacrifice is also significantly stronger with this talent, which is good too.
Fel Intellect - 3 ranks.
Increases the maximum mana of your Imp, Voidwalker, Succubus, Felhunter and Felguard by 3 – 15%. Increases your maximum mana by 1 – 3%.
Not a very big increase, but it will mean more taunts for VW, 15% more damage from your imp before he runs out of mana, more seduces before succubus runs out, more mana for dark pacting, etc. It’s a nice little boost.
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Improved Succubus – 3 ranks.
Increases the effect of your Succubus’ Lash of Pain and Soothing Kiss spells by 10 – 30%. Also increases the duration of Seduction and Lesser Invisibility by 10 – 30%.
The extra seduce duration is the main thing this talent has going for it. Improved Lash of Pain is decent as well, moreso when coupled with Improved Lash of Pain in the Destruction tree.
Fel Domination – 1 rank.
Your next Imp, Voidwalker, Succubus, Felhunter or Felguard summon spell has its casting time reduced by 5 sec, and its mana cost reduced by 50%.
If you’re in a pinch and need a pet out fast, this is an excellent talent to have. If you couple this one with Master Summoner in the next tier, you will be able to summon a pet in 0.5 seconds, which can save your hide in both PvP and PvE situations. It can be used every 15 minutes.
Fel Stamina – 3 ranks.
Increase the maximum health of the Imp, Voidwalker, Succubus, Felhunter and Felguard by 3-15%. Increases your maximum health by 1 – 3%.
An all around nice talent. The health increase to your pets helps with tanking, and another 3% to your own is a little added boon.

Demonic Aegis – 3 ranks.
Increases the effectiveness of your Demon Armor and Fel Armor spells by 10 – 30%.
30 more damage from rank 2 Fel Armor as well as an additional 6% healing is not bad at all for such an early talent.
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Master Summoner – 2 ranks.
Reduced the casting time of your Imp, Voidwalker, Succubus, Felhunter and Felguard summoning spells by 2 – 4 seconds and the mana cost by 20 – 40%.
Coupled with Fel Domination this lets you summon a pet nearly instantly. Excellent for PvP, but also has its uses in PvE. It is a nice talent by itself too, cutting both the slow cast time of your pets and mana cost almost in half.
Unholy Power – 5 ranks.
Increases the damage done by your Imp, Voidwalker, Succubus, Felhunter and Felguard's melee attacks / fire bolts by 4 – 20%.
More damage is valuable by itself, with the added bonus that it will let your pets keep aggro better.
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Improved Enslave Demon – 2 ranks.
Reduces Attack speed and Casting speed penalty of your Enslave Demon spell by 5 – 10%, and reduced the resist chance by 5 -10%.
Enslave is useful here and there. If you use Enslave a lot, then by all means get this talent. If you don’t, steer clear.
Demonic Sacrifice – 1 rank.
When activated, sacrifices your summoned demon to grant you an effect that lasts 30 minutes. The effect is cancelled if any Demon is summoned.
Imp: Increases your fire damage by 15%.
Voidwalker: Restores 2% of total health every 4 seconds.
Succubus: Increases your shadow damage by 15%.
Felhunter: Restores 3% of total mana every 4 seconds.
Felguard: Increases your Shadow damage by 10% and restores 2% of total mana every 6 sec.
Although you lose your pet to gain the buff, the effects granted can more than make up for it.
The talent has a lot of raid potential. Note that you can have both a sacrificed demon buff and an enslaved demon for a pet.

Master Conjurer – 2 ranks
Increases the bonus Fire damage from Firestones and the Firestone effect by 15% - 30% and increases the spell crit rating bonus of your Spellstone by 15 – 30%..
The added firedamage from a firestone is quite nice for a destruction specced lock, but consider that you are spending 2 talent points for a +9 fire damage bonus.
Spellstones see a little more use in PvP, but again, the bonus gained through this talent is tiny; +6 spell crit.
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Mana Feed – 3 ranks.
When you gain mana from Drain Mana or Life Tap, your pet gains 33-100% of the mana you gain.
This will keep your pet mana'd up indefinately, putting at least a single point in here is mandatory if you're planning to use a pet for damagedealing.
Master Demonologist – 5 ranks.
Grants both the warlock and the summoned demon an effect as long as that demon is active.
Imp: Reduces threat caused by 4 – 20%.
Voidwalker: Reduces physical damage taken by 2 – 10%
Succubus: Increases all damage caused by 2 – 10%.
Felhunter: Increases all resistances by 0.2 – 1 per level. (+70 to all resists at level 70)
Felguard: Increases all damage caused by 1 – 5% and all resistance by 0.1 – 0.5 per level. (+35 to all resists at level 70)
Another superb talent. The aggro reduction the imp provides is excellent for raids. If you always wanted to do more damage but couldn’t in fear of stealing aggro from the tank, this is a big help.
The Voidwalker effect will make him and you a better tank along with making Soul Link (if you have it) more effective.
The Succubus effect is simply a 10% boost to your total damage, which is always great.
The resists provided by felhunter will make it even harder for someone to land a spell on him, and will give you a much better chance at partial or complete resists as well. If you have some resist gear to boost it further, casters will have a much harder time fighting you.
Felguard takes the middle road, and while I would've personally preferred a purely damage oriented bonus, the effect is still helpful.

Demonic Resilience – 3 ranks.
Reduces the chance you'll be critically hit by melee and spells by 1 – 3% and reduces all damage your summoned demon takes by 5 – 15%.
This talent is awesome. 15% damage mitigation on your pet for three talent points, it would be a tank's dream come true. Don't get it if you aren't planning to use a melee pet most of the time though.
Soul Link – 1 rank.
When active, 20% of all damage taken by the caster is taken by your demon instead.
You will also deal 5% more damage.
Soul Link remains active until you zone or your pet dies / is unsummoned / Enslave breaks.
Yup, 5 stars, as this is another gem. Using this, especially with a higher hp pet out, will make you much harder to kill. Add in the fact that you can nearly instantly summon another pet every 15 minutes if you grabbed the necessary talents and you have a great talent. With a decent damage bonus your health funnel will heal quick enough to make soul link useful with any pet you have out. Expect trouble in raid situations where lots of heavy AE is being dished out, though.
Demonic Knowledge – 3 ranks.
When active Increases your spell damage by an amount equal to 5 – 15% of the total of your active demon's Stamina plus Intellect. Every pet except the imp will give you the same amount of spell damage, around 100-130. The imp provided 20 more because his base stats are higher.
It amounts to being a quite large spell damage bonus for just a few talent points. The only good reason to skip this talent if if you are planning to run with a sacrificed demon most of the time.
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Demonic Tactics - 5 ranks.
Increases melee and spell critical strike chance for you and your summoned demon by 1 – 5%. Not too overwhelming, but seeing that it grants the bonus to both you and your pet, its not bad.
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Summon Felguard - 1 ranks.
Summons a Felguard under the command of the Warlock. The Felguard makes for an excellent pet. His AE avoidance ability allows him some leeway in raid encounters, his intercept is very useful in both solo and PvP play. His damage output is respectable, and his 50% AP buff becomes extra effective when coupled with buffs.