Qhik is a moron
Greetus is at first glance a common imp. A bit larger and more civilized but besides the shining collar around his neck there is no visual difference. The collar is an incredably power object said to have sacrificed universes to create binding Greetus to this world and to his current form.
Thousands of years ago the imp known as Greetus went by many names. The Destroyer, Bringer of the End, The Black One some where even convinced he was the actual devil. During the second age Greetus was a very different being he had risen to take total control of the abyss and had begun to take over other planes. By the time he got to our plane he was met with resistance unlike any before. All the people of the world unified against him in a way that no others had done before. The mighty City of Shellrath stood against his armies while a lone adventurer sought out Death himself to find the power to fight back. Armies across planes joined together to fight across one tiny little speck in the multiverse. They stood their ground ridding behind Death as he lead charges against demons. Meanwhile a group of powerful magic users bannded together to create an item of unimaginable power they consumed three planes and all of their lives in order to make it they created an object that could contain the power that now threatened all of existence. After the final charge Death lead a group of some of the greatest heroes in existence to seal him away.
Not much is known about what happened after that accounts vary and are very vague at best. He was finally rediscovered by The Phoenix King at the beginnings of the great war and has been with the guild ever since