Second Age
During the Second Age, the Valar's main deeds were the creation of Númenor as a refuge for the Edain, who were denied access to Aman but given dominion over the rest of the world. The Valar, now including even Ulmo, remained aloof from Middle-earth, allowing the rise of Morgoth's lieutenant, Sauron, to power as a new Dark Lord. Near the end of the Second Age, Sauron convinced the Númenóreans to attack Aman itself.