Feyrime Warlock [3.5 PrC][Peach]

[gooddragon1]

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[SinsI]

I see no reason anyone would want to take this class, as a straight up Warlock is far better.
Eldritch Blast is a prerequisite - but it has longer range, does more damage, is immune to heat effects already, and you can apply modifiers that are much better than Chilling Lash.
Wings at level 14+ are too late - Fell Flight was available at 6th level.

+3 BAB and 10 more hit points are simply not worth everything it loses.

[SinsI]

There is no "magic immunity" in D&D, only Spell Resistance.

Haste should be irrelevant just as things like Persistent Divine Power or Necropolitan template.

[SinsI]

Oh, that immunity. Just Vitriolic Blast it away.

Haste is not part of warlock's class abilities. And Imbue Item (the only reliable source of it) requires 12 levels of Warlock (and probably a couple levels of Chameleon), so has bad synergy with your class. Plus "not getting extra attacks from Haste while still receiving extra iterative attacks from BAB" is so counterintuitive any sane DM is going to house-rule that you do get it with Eldritch Glaive. http://www.giantitp.com/forums/archive/index.php/t-155699.html suggests that it is not even a house rule.

Since you can evade Attacks of Opportunity by casting defensively with DC 16, that part becomes irrelevant by level 12 at latest.

I think the main problem with your class is that it is 10 levels, and most of them give things that are not exciting at all. Hellfire Warlock is only 3 levels deep for a reason.
And just what are you gaining for those levels? Resistance to Cold? Resist Energy is a 2nd level spell on Sorcerer/Wizard list, provides better bonus, and is cheap at that level.
Swift Draw? Just how often are you planning on doing that? Note that if you do it outside of combat, you gain absolutely nothing from this ability.
Extended Leash is not that bad, but since you already have Eldritch Glaive with longer reach, it is going to be relevant only in extremely rare situations (like against the aforementioned Golem).
Chilling Leash is decent, but it has to compete with Noxious Blast (Fortitude save for 1 MINUTE) of nauseated, and Incarnum Blast (Fortitude save for Dazed - better than stunned). And since your Fortitude Save is Class level - it has worse DC than either of those.
As I've said, Wings are a joke for 14th level. Even without Fell Flight you can get those for 10k-14k gold.
The Capstone is as mediocre as they come. Unless your game world has extreme aging problems, all it gives is +1 Int, +Wiz and +1 Charisma.
At that point Darkvision is nothing, and Warlocks get damage reduction /cold iron already - so yours wouldn't stack.

Warlock is extremely Feat-starved and Invocation-starved class. Your prestige class not only doesn't address those problems, but rather aggravates them since it learns no new Invocations and doesn't improve Eldritch Blast.

[SinsI]

Eldritch glaive only has a 10 foot reach I think.

It has a reach of "as if you are using a reach weapon". If you are large (easy to get), it is 20 feet.

Also, note that last 9 levels of this class only give +2d6, and only to that Leash. If you get +1d6 to it for 5 Warlock levels, wouldn't it be far better to just dip 1 level of Feyrime and continue with regular Warlock? He gets Energy Resistance to two types, his Damage Reduction is earlier (although lesser) and he gets the all-important Imbue Item - and doesn't lose on Invocations.