Well, it's not intended to be the final boss of the campaign.
That would be the Queen...but I haven't statted her out completely yet.
But, my players are a group of massive min/maxers. So they should be able to hold their own in a fight against the Overlord.
You make a good point though. I was worried about the claws...I'll tone those down a bit.
Should I throw a save ends on the stun?
And if you have any ideas for other abilities that would work for the Overlord, I'd love to hear them. I'm new to homebrewing, so I'm a bit wary of what I should and shouldn't add to a monster.