Did You Know? 18
In the first edition Dragonlance Adventures handbook, pcs on Krynn could only be a max of 18th level? The rules stated that if a character went beyond 18th, the PC would leave Krynn for some other realm. I always figured this was an attempt to keep power levels somewhat under control, as opposed to Greyhawk (and later the Forgotten Realms) where plenty of NPCs exceeded 25+