| Cool stuff. I like it. Personally, I'd add Thievery to the class list (the Warlock has it, too), because I think it'd be an interesting variation on the defender. And I like the idea of having an ability that weakens saves, but doesn't use that power personally. Sort of gives the class a leader-like ability.
I'd give the class a bit more of a sub-type, and stick to that in your design. It's a defender, first and foremost, but it should dabble in another role. Striker is an obvious one, but I think there are too many strikers out there right now. Leader could be interesting, and that save power encourages it, but it doesn't seem right for a hexblade. Now, Controller would seem perfect - this is a great class for general de-buffs. I'd almost tack on a debuff effect on most of their attacks.
Also, I'm getting tired of seeing defenders that have a "mark and hit" effect. Instead, I think it'd be kind of cool (and fitting with the controller idea I just mentioned) to instead give the class a power like:
"Aura 2. MArked creatures treat all squares in the aura are treated as difficult terrain."
In essence, I hit you, and you are stuck fighting me. You can't shift, and if you move away (which is going to be hard), I get to swing at you. I think it's just a minor change that would give the class a bit more flavour than the swordmage-like Evil Eye.
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