I've checked many suggested talent builds for Demonolgy Locks in this forum and everybody misses out the most amazing talent: Mana Feed.
With Mana Feed your Felguard will never ever run out of mana, this means you can simply have Anguish, Cleave and Intercept on auto-cast and since my pet can just spam all these skills whenever they get ready I'm having a really hard time now to get the aggro.
To sum this up:
- MAX DPS with 3 DoTs, Drain Life spam, perma-Cleaving Felguard - very fast killing
- Pet is never running out of mana
- You are never running out of mana due to Drain Life / Lifetap - No Downtimes at all
- Your gear won't get red, because you aren't getting hit
Q: Why didn't you skill Improved Healthstone? I really need it!
A: You won't need it as long as your profile doesn't completely suck. (3 adds all the time or more)
Q: Why did you skill Fel Concentration when your pet has the aggro anyways?
A: It can always happen that your pet dies, so you can draintank the remaining adds better and won't be totally screwed, plus when you have a total kickass gear (tons of spelldmg) the best pet won't hold the aggro forever, that's where you will really need this talent to keep on gliding mana-efficient.
Q: Why didn't you skill Demonic Tactics?
A: I'm playing with DoTs & Drain, so I won't need the 5% spellcrit and my Felguard is doing fine without this talent, the points are placed better elsewhere. I'm better having a perma-Cleaving Felguard (Mana Feed) than a Felguard with 5% crit more and no mana, the Cleaving one will do a lot more damage overall.
This really boosted my xp/h a lot so I'm gonna share the talent build, enjoy.
Talent Calculator - World of Warcraft