Pathfinder made a Planar Ally-based spell line for calling Fey and granted it to Druids and Bards.
ENTICE FEY, LESSER
Source Ultimate Intrigue pg. 213
School conjuration (calling); Level bard 4, druid 5, hunter 4, medium 3, ranger 4, shaman 5, skald 4
CASTING
Casting Time 10 minutes
Components V, S, M (offerings worth 500 gp plus payment, see text), DF
EFFECT
Range close (25 ft. + 5 ft./2 levels)
Effect one called fey, with 6 Hit Dice or fewer
Duration instantaneous
Saving Throw none; Spell Resistance no
DESCRIPTION
This spell functions as lesser planar ally, except that you entice a fey of 6 HD or fewer to lend you its aid with an offering of music or something else it finds appealing. Like lesser planar ally, this spell is unpredictable, and the fey who answers the calling is up to the whims of nature and the fey, not your own choice. You must succeed at a Knowledge (nature) check or Perform check (DC = 20 + target’s HD) in addition to the spell’s material component to entice the fey into appearing, after which you can negotiate for the service and your payment. The maximum HD of fey that you can call with that casting is equal to the result of your check – 20. For example, if your check result is a 24, the maximum HD for the called fey is 4. A high result doesn’t allow you to break the HD maximum for the spell, and a result of 20 or less means you can’t call a fey at all. If the fey doesn’t like the sound of your offer, it can simply choose to refuse, in which case you don’t expend any of the material components for the spell, either the offerings or the payment.
Entice Fey reads "This spell functions as
lesser entice fey, except that the spell’s whimsical calling can produce a single fey of 12 Hit Dice or less, or two fey of the same kind whose Hit Dice total no more than 12." with 1250gp offering cost and spell levels "bard 6, druid 7, shaman 7, skald 6".
Greater Entice Fey reads "This spell functions as
lesser entice fey, except the spell’s whimsical calling can produce a single fey of 18 Hit Dice or less, or up to three fey of the same kind whose Hit Dice total no more than 18." with 2500gp offering cost and spell levels "druid 9, shaman 9".
Now, getting a calling spell is very handy for Druids and Bards, but there are real drawbacks on this one. Aside from needing to overcome the skill check, the list of Fey out there is not that big and you are by no means guaranteed to have Fey favorable to you answer your spell. In a way, it's a worst of both worlds spell, since Planar Binding lets you summon whatever you like, although you need to compel them into service, and Planar Ally at least has your divine helpers sent to you by your patron deity, who is obviously favorably disposed towards you. Entice Fey does none of these things, and can indeed by answered by anyone or anything that is a Fey of appropriate HD.
So, the major question here is: How do we put Entice Fey to good use?The skill check at least isn't too difficult to overcome. While the temptation is for a Bard to use a Perform check while taking 10 to hit the DC, a Bard can also easily overcome it by using Lore Master and Bardic Knowledge to take 20 and add half his Bard level to the check (or even using the
Pageant of the Peacock masterpiece to substitute a Bluff check with a +4 bonus for it), so even if he substituted out Versatile Performance, he can still hit it no problem. Everyone who can cast Entice Fey can also cast
Tears to Wine for an easy, large bonus to the Knowledge check in question and Druids get a +2 bonus to Knowledge (Nature) checks. Put ranks in Knowledge (Nature) and anyone will make the checks by taking 10.
But when it comes to the Fey you are calling, we really need to put a finger on the scales somehow. One thing that occurs to me is that since it functions as lesser planar ally, "if you know an individual creature's name, you may request that individual by speaking the name during the spell (though you might get a different creature anyway)." That means that any Fey we are friends with is going to be callable and favorably disposed towards us. With a
Fey Gate (or
Plane Shift or
Gate) spell, presumably we can go over and make friends there, although that'll be an adventure. The upshot of it is getting allies in the form of callable fey. Another point is that if you worship one of the Eldest (in the Golarion setting), probably you can get high-ranking fey associated with them to show up, making the spell function a bit more favorably. That would probably work best if you are actively working for one of the Eldest, rather than just a worshiper.
We do get one more advantage with Entice Fey. Planar Ally stipulates that "few if any creatures will accept a task that seems suicidal (remember a called creature actually dies when it is killed, unlike a summoned creature)." However, Entice Fey overcomes this by sheer dint of the fact that we are calling Fey, who in the Golarion setting, will typically return to life in the First World whenever they die, as a general rule (there are exceptions, and they are mainly carved out for use of the First World Creature template). Most fey also regard death as a curiosity, owing to their immortality on the First World. As such, most fey are not afraid of suicidal ventures.