Tier One – I have used my instant-cast Corruption in almost every single fight since level 14. As far as I’m concerned, it’s a staple of every warlock build. Put five points into Improved Corruption and never look back, because Suppression just doesn’t compare.

Tier Two – The mark of an experienced warlock is whether or not he leverages Life Tap. If you’re savvy enough to recognize its value and wise enough to know when to use it, you’ll rarely run out of mana. Thus, two points in Improved Life Tap is your first stop. The next two should go into Soul Siphon to improve your Drain Life. Put the last point into Improved Drain Soul or Suppression, whichever suits your fancy.

Tier Three – Amplify Curse is always nice, so pick that up first. Put your other four points into Fel Concentration, because nobody likes to be interrupted while they’re sucking the life out of their opponent.

Tier Four – Throw your DOTs, spam Drain Life, and let fly with the instant-cast Shadow Bolts whenever Nightfall procs. Add in the fact that you have a tweaked out Felguard beating your opponent to a pulp and you’ve got some nasty DPS going. Put two points into Nightfall first. Use your next point to finish off Fel Concentration. The last two can really go anywhere you like; I chose Grim Reach just because I like to Drain Life from a mile away.

Here’s the visual breakdown of the revised felguard build at level 70. Note that I’ve made some revisions on the original based on recent patches. Most notably, I took a lot of points out of Demonic Tactics, which now gives a boost to crits instead of a straight damage boot.

Best regards Philip