Times Silent Keeper
Eternal Dragon of Time
In Game Name: Dragon
AQ's 10th Anniversary: Conclusion
Bio: Living in the Void, the Eternal Dragon of Time maintains time and order throughout the universe. His heart, an hourglass filled with the sands of time, continues absorbing the the dark energy from great monsters we have defeated thus far. If magical words are not spoken to it every 10 years, it will grow a head for each great monster, which will stop at nothing to destroy the world, universe... and multiverse. And the deadline for saying these magical words was... yesterday.
Function: Has six heads, each a boss battle that will fight you at the end of every Act.
First image thanks in part to Abaraa and zippy2010. Thanks Dragoon23 for the six-headed image!