Does it need any more special abilities, or shall we move on to the remaining bits?
		
		
	 
They still seem a bit underwhelming for creatures that are supposedly the ne plus ultra of elementals.
How about giving them some (or, preferably, all) of the following:
A wide-area version of a Lavawight's Heat Aura:
	
		
			
				SRD said:
			
		
	
	
	
		
			
				SRD said:
			
		
	
	
		
		
			A 10-foot-radius spread heat aura surrounds a lavawight. All creatures of the fire subtype in the field (including the lavawight) are treated as if having turn resistance +6 (if undead) and fast healing 10. Creatures subject to fire damage take 2d10 points of fire damage each round they remain within the heat aura.
		
		
	 
Something like this:
Elemental Aura (Su): A 100-foot-radius spread aura surround an Elemaster. All creatures of the same Elemental subtype as the elemaster (including the elemaster) are treated as if having turn resistance +6 (where appropriate) and fast healing 10. Creatures without immunity to to air/earth/fire/water [delete as appropriate] effects take 2d10 points of electricity/bludgeoning/fire/acid [delete as appropriate] damage each round they remain within the aura. The elemaster can exclude creatures from its aura's effects in any number or combination as a free action.
I also fancy some kind of unique attack ability. Either a separate ability  for each Elemaster or elemental variants of the same ability, or both.  Here's a suggestion:
Elemental Transubstantiation (Su): X times per day, an elemaster can  turn all objects and corporeal creatures in an area up to Y in extend  into elemental substances of its own type - e.g. an Earth elemental can  turn air or water into gravel. This power has no effect on creatures of  the same elemental subtype as the Elemaster. Affected targets are  entitled to a DC X Fort? save to resist the transformation. The  elemaster can choose to make this transformation fatal to corporeal  creatures (e.g. an air elemaster literally evaporates its opponents) or  transform them into elemental creatures by applying the Z template, such  creatures are affected by an elemasters' master elemental power (see  below).
The "Z template" is probably just "target's type becomes Elemental or  Outsider with the same subtype as the Elemaster, all other abilities  remain unchanged".
They ought to be able to command elementals as well:
Master Elemental (Su): An elemaster can turn or destroy  elementals or outsiders of the opposite subtype (e.g. water for a fire elemaster) as  an evil cleric rebukes undead. An elemaster can turn, rebuke, command,  bolster or destroy elementals or outsiders of its own elemental subtype as a good  cleric turns undead or an evil clerics rebukes undead (unlike mortal clerics, an Elemaster is able to both turn and rebuke its subjects). Master elemental does not affect  other elemasters. Elemasters can use master elemental as many  times as it wishes.
Some kind of "high level summoning" that's more powerful than the 
elemental swarm Elemasters can use at-will would also seem to be in order:
Summon Elemental Court (Su): An elemaster can summon [some combination of Elder and Primal elementals] per day. This ability is the equivalent of a Xth-level spell.
What do you think?