When the Burning Crusade launches, healing over time (HoTs) spells such as Rejuvenation and Renew will stack for every player casting them.

For instance, if there are three priests in a target’s group, a target could potentially receive three renews at the same time. Also, we're going to be scaling Warlock and Hunter pets come expansion so that they become stronger as the player gains more statistics through itemisation.

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Area 52..
Little green... men.. oO