Hmmmm, not a lot of this information is useful, or even correct. Here are some facts:
1) Phara Dar is a *cleric*, not an enchanter. Why? She does a CHeal if she can, I know of no enchanter mobs that can pull off a CHeal...
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2) PD does not "mezmerize", it's an AE stun, which lasts like 10 sec or so. Stuns are used by clerics, although this one is an AE stun (and yes, I'm fully aware that chanters have AE stun as well, but PD is still not an enchanter, he's a cleric!).
3) Get your MR up way up there. Even at 200+, it's hard to resist the stuns. But, it can be done, so drag your bards with you on your next clearing of VP. You can maybe use some "geographics" to your favor, but I don't think you can avoid the AE stun entirely, without very high MR.
4) Phara Dar *will* gate if given the opportunity. Two enchanters can mana sieve enough to avoid the gate, but he will CHeal at least once. With a few more enchanters, you might be able to sieve her dry before she even gets the cheal off. But, to avoid an annoying CR, possibly with SC, make sure she's dry before she tries to cast the gate.