I have ideas and I have no choice but to share them... >.<
Star Bearer: These Collosal Elementals are created entirely out of the stuff of stars, and as such burn brighter than the fires of the elemental plane. Their very presence can turn forests to ash and irradiate planets, and while on the surface of the sun they can trigger solar flares, sun spots, or even novae.
Apocalypse Warriors: Once there were hundreds of thousands, but they fought amongst themselves until only ten remained. These last few are unstoppable warriors, sworn champions of the Cosmic Powers of Death, beyond even the greatest of deities worshipped by man. Through blade and hate, they purge entire planets of life, leaving only barren rock behind them.
The Juggernaut of Agony: A living being of Giger-esque madness the size of a small mountain, prowling the Plain of Shadows and preying upon the myriad worlds of the universe, sending foul children forth to sow war and torment that create echoes for the mammoth obscenity to feed upon.
Paradoxia: Paradoxia are very strange creatures that exist in causal loops. They were never actually created - They simply travel through time at will, finally returning to the point they started from and repeating the process forever. This grants them enormous insight, as they have literally already fought any battle they are in an infinite number of times, and they also cannot be truly killed - But slaying a paradoxia prevents it from manifesting in the timestream for another ten thousand years. (Inspired by Stephen Baxter's Vacuum Diagrams, which is really awesomely cool.)