[@Jamesyco]
"Myrrhis specializes in Countermagic, detecting (She can sense long-duration spells and enchanted items within 20 m of her, unless blocked such as by a wall.), disrupting the casting of (She needs to see the caster.) and dispelling already existing spells.
[i]Dispelling runes and enchanted items is beyond her capability, as might be more powerful long-lasting spells.[/i]"

That work?