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.
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.