Naj's page

D&D 3.5's Libiris Mortis has the Necromental template.

Is there a pathfinder equivalent of that? or something with the same undead/energy drain/create spawn combo that can be added to an elemental?

I would just add these abilities and custom create my own, but then I wouldn't know how to calculate CR. (don't want to party wipe my players).

So an air elemental's turn could go something like this:

rd1) Start Whirlwind(reflex saves)+ move
rd2) Move
rd3) Move
...
Last rd)Whirlwind effect ends (non-action), trapped PCs freed(non-action), start whirlwind(reflex saves)+ move

or would the effect stop at the end of the elemental's last round, giving all the PC's time to scatter? then the elemental can start all over again.

Also, RAW says " ...A creature that can fly is allowed a Reflex save each round on its turn to escape the whirlwind...", and then it says"...Creatures trapped in the whirlwind cannot move except to go where the whirlwind carries them or to escape the whirlwind. ..." Does that mean that PCs with no flying ability who failed their reflex saves are stuck until the effect ends?

Is ending the whirlwind a standard action too?

How many times per day can an air elemental use its whirlwind ability? It doesn't specify in neither the monster nor the ability.

There is an example in the whirlwind ability description that says 3/day, but I don't know if this is an example, or if the 3/day is a blanket description for all creatures able to use the whirlwind ability.