I think being nigh unkillable would actually be a good way to go for multiboxing, especially when starting out. You get more time to figure things out, and therefore less frustration. As a tankadin, I ran into a horde paladin in SM, and we fought to a standstill, so I can see the utility in being hard to kill. I'm definately going to go try it. Maybe i'll make them all draenei, 5x GotN could go a long way! And I can make a "seal/judge" macro that judges with 5 unique judgements. I can make a "taunt" cast sequence macro to keep mobs confused, further enhancing survivability. 5x consecrate should tear things up. 5 auras, 5 blessings, everyone can self heal....