The Maddening Roar
Irian the Eternal Day is a plane of positive energy. The plane is suffused with positive energy not enough to harm life, but enough to sustain unusual forms of life, though not necessarily good aligned creatures.
A brilliant white sun hangs in a beautiful blue sky while rivers of liquid glass flow down from mountains of quartz. Deserts made of pure white sand and forests of crystalline growth cover the landscape.
On Eberron, one can be brought back after death as either an undead or as a deathless. Those that are undead are said to have been infused with the essence of Mabar, while deathless have been infused with the powers of Irian.