Kordeth said:
R Deadly Gaze
Encounter * Gaze
Standard Action Ranged 5
Target: 1 Creature
Attack: [Critter Attack Bonus] vs. Will
Hit: Target is weakened (save ends). First failed save: Target loses 1 healing surge. Second failed save: Target is slowed (save ends). Third failed save: Target is reduced to 0 hit points.
That is nice. But I added a little twist. I gave it recharge 5, 6. AND --here is why I love 4E-- I invented a new mechanic: the power starts UNCHARGED, in other words, he has to successfully recharge to use it. Why? The description of the catoblepas has always included that he has a long neck and has a hard time bringing his head up. Now, there is no real 3E way mechanically to reflect that, other than the non-3E-ish 25% chance mechanic from the original description. So I am using this recharge mechanic to simulate that. (I'm kinda proud of myself for that one).
So, try something like this on for size:
R Deadly Gaze (standard; recharge 5, 6)
* Gaze
Range 10; power begins not charged and must be successfully recharged before it can be used.
Target: 1 Creature
Attack: [Critter Attack Bonus] vs. Will
Hit: Target is weakened (save ends). First failed save: Target loses 1 healing surge. Second failed save: Target is slowed (save ends). Third failed save: Target is reduced to 0 hit points.
Or something like that.

Cool, huh?
By the way, its tail and clubbed tip will have huge reach, perhaps Reach 5 (consistent with the description).
Its head and neck will have Reach maybe 3 or 4, for a bite (though this is not much of an attack and mostly just lets the creature snake its head around for gaze attacks). It is LONG!
Here is the text that I took the recharge idea from:
"Otherwise, the very weak neck of the catoblepas has only a 25% chance of raising the head high enought use its eyes. ..."
[those arent the exact ways we stated up the gaze attack, I was just modifying the prior post; ours is a bit different, but it is a standard action with a recharge. Yes, I agree that is nasty; and ours is based in part on the bodak gaze]