I don't really like adding any hp damage, as this seems potent enough.  
Isn't option number 4 the same as option number 1?  In any case, is option 1 an acceptable compromise?  A cone like the original but without excessive hp damage?
		
		
	 
Yes they are the same. Well, except for a stray fullstop somehow wandered into it and the X, Y and Z having a different arrangement.
No 1 was a cone, which was turned into a radius in No 2 and then back into a cone.
Guess that makes this a circular argument. 
 
Hmm, I am still tempted to have it do some hit points damage. Maybe go back to the original "damage only on a failed save"?
I also wouldn't mind increasing the mental damage...
 
Death Throes No. 5 (Ps): A dying wingless wonder lashes out with  a powerful psionic blast, covering a 60 ft. cone directed towards   whichever opponent killed it. All creatures within the cone take 
X [1d8?] Int damage and are confused for 
Y [1d4?] rounds. If a creature succeeds at a DC 
Z [14?]    Will save they instead take 
Z [1d12 of some kind of energy?] damage and are not confused. This is a    mind-affecting effect. The save DC is Charisma based and includes a +
Z-12 [+2?] racial bonus.
Boy, who would have thought these things would take so long?