House Stark. Non-Loyal.
Character. Cost: 2. STR: 1.

Ally.

Challenges Action: If you control a participating character, kneel a Direwolf character or a character with a Direwolf attachment to have it participate in the current challenge on your side. (Limit once per phase.)

Richard Hanuschek
The Road to Winterfell #21.

Link: Decklists

Winterfell Kennel Master
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Rules FAQ

Kennel Master doesn't care about challenge icons or stealth. Those requirements are only checked during the "normal way" to add characters to a challenge, during the"declare attackers" and "declare defenders" frameworks, whereas this ability is an action performed during an action window within a challenge.

For example, Catelyn Stark with Lady (a Direwolf attachment) can be made to participate in a military challenge with the Kennel Master's ability (provided you already have a different participating Stark character).

Likewise, if Catelyn is stealthed, she can still be added as a defender with the Kennel Master's ability.