Q: If I make the Righteous Strike Attack action and target an enemy leader, and the attack fails, I can make a reaction to make the Attack action again. If it fails a second time, can I make that reaction again (as it is triggered by the new Attack action’s failure)?
A: Yes
Q: Where Lightning Blast says ‘When they make a critical hit’, does ‘they’ refer to Obryn?
A: Yes
Q: If I use Fatal Riposte and Steelheart has a Scything Attack action (e.g. his Mighty Swing) can I use that Attack action rather than an Attack action that only targets the attacker?
A: Yes, as long the attacker is one of the targets
Q: How do I use Tireless Assault with a Scything Attack action, such as Severin Steelheart’s Mighty Swing?
A: A Scything Attack action is treated as a number of individual Attack actions performed one after the other, and each of those Attack actions is separately judged as succeeding or failing. If one of the Attack actions made as part of a Mighty Swing fails, you can play Tireless Assault (this can interrupt the Mighty Swing, and indeed will, unless the Attack action you are reacting to is the final Attack action made as part of Mighty Swing) to make another Attack action that targets the same fighter. This could be another Mighty Swing (allowing you to target other fighters as well). Once you have resolved the reaction, if it interrupted Mighty Swing, you would then finish resolving Mighty Swing (unless that was no longer possible)
Q: Can I play Sigmarite Wall if I do not have two friendly fighters adjacent to each other?
A: No
Q: Can I score Sigmar’s Bulwark following an action phase where none of my fighters were alive?
A: Yes
Q: Can I score Sigmar’s Bulwark if one of my fighters was damaged and then healed for the full amount (and all other fighters were unharmed)?
A: No
Q: Can Angharad’s Furious Parry be used in the same way as other Attack actions, or can it only be used as a reaction?
A: It can be used in the same way as other Attack actions
Q: If Angharad Brightshield is attacked, and becomes Inspired as a result of her defence roll, can she use her Furious Parry reaction if the attack fails?
A: No. She only becomes Inspired at the next Inspire step after the Attack action is resolved, which means the opportunity to react with Furious Parry has already passed