Ademar is a character that appears in For Honor's single player campaign.
Ademar was Holden Cross' second in command during the first mission of The Knights campaign, Warlords and Cowards. When Daubeny refused to duel Cross, Cross suggested that he fight Ademar instead. Daubeny selected The Warden as his second for the duel, prompting a duel between them.
The Warden acknowledges Ademar's skills in combat, thinking that he might had been a Warden before joining the Blackstone Legion. However, he was defeated by The Warden, who may have replaced him shortly after his defeat.
Nothing is really known about Ademar, as he only speaks once during the beginning ordering the soldiers to "break it down". It is possible that he is loyal to Cross, as Cross has him as a second.