Yeah, fire pet DS is powerful and ideal for low blues that won't hit too hard but he's far from some kind of god. He has low hp so against tougher stuff or things that nuke he will die fast. You can use him to chain pets but keep in mind when chaining he doesn't recast his DS instantly and won't cast in combat. One way to get around that is if he hasn't casted yet you can keep /pet back off to unaggro him and eventually he will cast it on himself in between getting hit by the mob.
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