The last of the original Oneroi counsel, Madoc is an Enforcer who watches over both the Oneroi and the Skoti. He is quick to issue orders but seldom takes them. Madoc is the Oneroi of last resort. When he comes after you, you know you're going to pay. He often takes the jobs no one else wants to do.
His Father is Adarian Malachai, making M'adoc a would be inheritor of the Malachai powers and status. However, since his mother was a Dream-God, M'adoc inherited her powers as well as the curse of the dream-hunters. Since he was cursed and stripped of his emotions, he did not possess the anger and hatred to kill Adarian and take his powers and title.
When Zeus punished the Dream-Hunters, their real names were forbidden and he attached prefixes to the leaders' new names so everyone would know their role. The M' in M'Adoc indicated that he was an Enforcer. After the Dream-Hunters broke free of Zeus, Madoc dropped the apostrophe retained the prefix but as a reminder of all they had suffered.