Who is The Creator of the Last Continent, and The Trickster from The Last Continent: A Discworld Novel and what is their importance?

The Creator of the Last Continent, and The Trickster is responsible for finishing the last continent on Discworld, Fourecks, the Creator works in concert with an eternal companion, the Trickster. They operate out of another desert world, coming and going by means of primitive paintings on rock walls. It is stated explicitly that "Creators aren't gods. They make places, which is quite hard. It's men that make gods" (p. 61). The Creator of the Last Continent first appears to the hapless protagonist, Rincewind the Wizzard, as an aged aborigine on a continent that closely resembles Earth's Australia.