So, a character has an artifact granting the ability to cast
Holy Aura. Another character casts
Antimagic Field and the two effects overlap, so that the origins of both spells are within both spell effects.
Can someone cast
Dispel Magic on the
Holy Aura effect since its radius (30ft) exceeds that of the
Antimagic Field (10ft)?
The argument raised against being able to dispel it, is that since the effect is active on a creature, then it is the creature that must be targeted, differentiating this case from a
Grease spell for example.