Haha Ya they're not real terms I suppose you could argue, but many of you figured out what I was saying.
Multi-Drain-Hunting is simply a term I'd use to say Drain hunting multiple monsters at once while still trying to keep a good portion of the attention on your Voidwalker. With Improved Drain Soul your agro is less of a problem, and with Siphon Life in at 30 you get a new set of options. VW collects, you DoT, if anything agros finish it like like a Drain-Tank, or you can puposely pull one (some) off the pet and then split the load. This is simply a good way to spread out your DoT damage and makes for a great transition into finally dumping the VW and Drain-Tanking.
Drain Tanking to me is litterally sitting there and taking hits as the monster wails on you. While the mana efficiency in the 40s-50 range is worth it, and with your new Dark Pact ability pumping a whole new level of mana into your grind this way works well but you begin to run into a few noticable problems.
Combining Fel Armor and +Spell along with Improved Lifetap and Dark Pact should result in a >100%hp ~95%mp after each fight. That's wasted energy. Now you could start shooting Sbolts at the monster, but then your DoTs become inefficient. There is no reason to let a monster wail on you in melee range, however, if you are not draining (exception being possible Social agro.)
Thats where Fear DoT comes in - DoT the monster and Fear him (Pull with Immo or UA, as hes running hit him with Corruption/CoA/SL, and fear.) He'll die off somewhere... usually before he makes it back to you though.
Now with great efficiency you're still finding yourself bored and at high levels of mana/hp.
Fear DoT... alot... at once... lol.
DoT Fear DoT Fear DoT Fear DoT DoT DoT IHoT DoT Fear Dot Fear DoT.... Just talking about it makes me happy =)
The PVP Gloves make for a ridiculous addition to this strategy, as DoT Juggling becomes totally viable regular 70s. Only obvious flaws here are some of the unfearable monsters... but hey no strategy is perfect.
If you find a good camp for this it's a ridiculously fast way to grind, I just made a few guildmembers jaws drop after helping them farm Motes earlier today. Ended up being me killing, Warrior Looting, Mage Herbing... Mage litterally couldn't keep up.