This invaluable sourcebook provides DMs and players everything they need to create and run planar adventures and campaigns.

• Complete rules and guidelines for creating characters skilled at plane travel and world-hopping, as well as new prestige classes, feats, spells, and magic items.
• Comprehensive descriptions of several different portal types, including their traits, characteristics, and game statistics.
• Rules and guidelines for designing an endless variety of new worlds and planes.
• Guidelines for altering existing creatures to create planar variants, and complete descriptions of many new extraplanar monsters and allies.