First, here's the rune chart.

The Ancients' power is that of a rock-paper-scissors relationship. Chattur'gha-god of strength and flesh whose rune is red-wins over Xel'lotath-goddess of the mind and madness whose rune green. Xel'lotath wins over Ulyoath-god of Magick whose rune is blue. Ulyoath wins over Chattur'gha. Mantorok-the corpse god of decay and chaotic order whose rune is violet-has power over all the other Ancients.

( And now, for the spell list! )