Avery was the first Death Eater to crack and grovel at Lord Voldemort's feet during his rebirth at the cemetery, saying that he didn't look for Voldemort after his downfall because he believed him to be "finished". He begged Voldemort to forgive everyone. Voldemort responded by using the Cruciatus Curse on him and saying he wanted thirteen years repayment before forgiving the Death Eaters for the lack of belief they had in him.
In 1995, Voldemort was seeking a prophecy that had been made about himself and Harry Potter, a record of which was kept in the Department of Mysteries in the Ministry of Magic. Avery told his master that it would be possible to obtain the prophecy by placing UnspeakableBroderick Bode under the Imperius Curse and having him get for them. This attempt failed, as prophecies are protected by spells that only allow them to be retrieved by the person about whom they are made. Voldemort punished Avery for this mistake.
Avery, when he was a student at Hogwarts, was described by Lily Evans as having an "evil sense of humour". She also called Avery and Mulciber "Death Eaters" before they became two of them, meaning that they had a passion with Dark Arts and blood purity. Avery was also disloyal, as he didn't search for his master after his downfall, and was characterized as a weak individual.