Abyssal drain in the new 24 man Weeping City for the trash is amazing highly undervalued as an AoE mob grabber helps in big AoE situations but you need Blood Price to keep it going or it'll be too mana intensive. The HP gain is worth it since it can crit giving you a ton of HP back if used correctly with CDs your healer(s) will love you. I recommend using this for long distance AoE pulls where mobs are grouped together, remember target the small enemies with mobs that are bigger/huge as you'll get all of them when targeting the smaller guys and only the target (big guy) if you hit them with it!