[quote=@Zeal]
<Snipped quote by Efficacy>

So how does affinity to magic aid us in defeating this being?
[/quote]

Someone with a strong enough Commandment at their disposal can directly block and cancel out the reality bending of another Covenant member with the same Commandment. That is, as long as they're not part of the same generation. That's why Seth and the other Master Scribes can't do it.