We just found a new way to do the critter kill squad. When you create a worgen, near the end of the quests, you have to pass a tunnel with some rats. A lot.
Take a worgen warior, give him this Enchant Weapon - Crusader - Spell - World of Warcraft on a good weapon, maybe a few + hp enchants on other stuff pieces, etc.
Now, run, spam Thunder clap, the crusader gives you instant full heal, and you're almost invincible, you just have to farm rats.
It works too with a druid casting Thorns, but you have it 20 scds every minute.
I don't know if we can go there with a high level character, I suppose there is some phasing, but I didn't try. Anyway, we did 20k with a lvl 13 warior, in less than an hour.
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Ps: Plz Elite this, or it will soon be hotfixed