Philip Jose Farmer 
Private Cosmos [EPUB ebook] 

It was a world of tiers and layers – the Amerind level, the Garden of Eden level, the Talanac, the Atlantean – a universe of green skies and fabled beasts. It was the playground-cosmos of the Lord Jadawin, with trans-gravitational gates to the other levels and other worlds. But now those gates were being sabotaged to permit the entry of an invading force of 'Bellers’ – human bodies housing the transferred minds of rebel Lords – and their minions, who were seeking two things: total domination of every lord’s private cosmos, now that they had achieved immortality, and the life of Kickaha the Trickster, who knew too much…