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).

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.