Spell Keys(PPO)

Even if a body's standing in the right ring or layer, she still might find that some of her spells don't work. That's just the way it is on the planes. But don't give up yet, berk — a spell key might set things right. A spell key is a special item, method, or even another spell that'll allow a particular spell to be cast. Without the right key, a spell could putter out halfway through or not even work at all. They only work for wizard spells, though (priest spells use the mysterious power keys). Cutters have to tumble to the nature of spell keys on their own. A lot of that stuff is dark to most folks. But the kinds of spells that need keys are pretty well known: 
• Divination spells that contact powers and creatures in the Inner Planes. 
• Elemental conjurations that summon creatures or effects from the Inner Planes. 
• Ethereal-based spells that need access to the Ethereal Plane. 
• Energy Plane spells that need access to the Negative or Positive Energy Planes. 
• Shadow magic spells that need access to the Demiplane of Shadow. 
• Spells of any type that conjure, contact, or tap energies from the Inner Planes, the Ethereal Plane, or any of the Demiplanes. These spells (like dismissal or drawmij's instant summons) might work just fine in the Outlands, but if a body wants to use them to reach one of those other planes, it'll take a spell key. By the way, any berk who figures on using psionic abilities to duplicate these spells or reach the Inner Planes, Ethereal Plane, or Demiplanes is out of luck.