Aura of a God (神のオーラ Kami no Ōra) is a state which grants a mortal god-like traits.
The state is attained by one who has received training to become a God of Destruction.
As noted by Top, the Super Saiyan God state possesses the Aura of a God.
Usage and Power
By activating his godly ki, Top's power increases to a whole other level from what it was before. This allowed him to fight on par with Super Saiyan God Goku and even defeat him in his Perfected Super Saiyan Blue form though, the latter was said to have dropped his guard (not used his full power in the Viz translation).
In the Tournament of Power, as Perfected Super Saiyan Blue Vegeta began overwhelming him, Top used this state's power which he kept in reserve in order to regain equal footing. In the anime, this state does not exist, and Top instead utilizes God of Destruction Mode.