One of the biggest advantages of playing a Warlock in Blizzard's World of Warcraft is having the underrated skill called Life Tap. This skill pretty much allows users to spam DOTs and Shadowbolts with abandon without having to worry about running out of mana.

Players have reported that Life Tap isn't working as expected. Blizzard QA Hortus has confirmed this, " Yes, there is a bug with Life Tap only returning mana based on your current mana instead of your maximum mana. This is being worked on."

So until the bug gets fixed, Warlocks out there might want to start using Life Tap a little earlier in a battle to keep their Mana topped up rather than the common practice of using it at the end for a final push.