It's my understanding that chain casting isn't mana efficient until the mob difficulty passes the ability to effectively cast renew to heal pet. Meaning that healing the pet is more efficient than casting a new one. Of course, with the clicky renew maybe that's not true. It's also my understanding that the mana you get back from renew is related to the pet's HP. For a pet with full health, you get back 100% mana. A pet at 10% health you only get 10% of the casting cost back. Which means chain casting is not efficient. Supposedly chain casting becomes more desirable in the level 50 range.
I used to play a mage years ago on live but it's been so long I forget specifics. Just started here so I can't guarantee any of this.
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