Rules FAQ
If an opponent plays Nightmares on Warrior’s Sons during a challenge, they will not be able to trigger their reaction.
If an opponent plays Treachery to cancel Warrior’s Sons reaction, they can then react to Treachery.
Army. The Seven.
No attachments.
Reaction: After an opponent plays an event during a challenge in which Warrior’s Sons is participating, move 1 power from that opponent’s faction card to Warrior’s Sons.
Link: Decklists
Rules FAQ
If an opponent plays Nightmares on Warrior’s Sons during a challenge, they will not be able to trigger their reaction.
If an opponent plays Treachery to cancel Warrior’s Sons reaction, they can then react to Treachery.