I've created an NPC with an aura. I'll be using her in the first game I ever host on FG2. Go night is still a few weeks away, and I want to know if there's any special way that I need to describe the aura to have at least some of its effects apply automatically. The aura extends for 2 squares and has the following effects:
Shadow creatures within the aura (including the NPC that generates the aura) gain concealment.
Enemies treat the area within the aura as difficult terrain.
Enemies that start their turn within the aura, or enter the aura, take 5 necrotic damage.
As of right now, the NPC must use a minor action to sustain the aura through the start of its next turn. It ends if the NPC assumes an insubstantial form, but can be re-applied as a minor action if that form ends.
This aura is a modified version of one from a monster in the 4e monster builder.
Is there a particular way to write this aura on the NPC's sheet that will maximize the number of effects that apply automatically?
If it helps, I'm not committed to the minor action thing, and I don't expect to have the aura automatically end when the creature is insubstantial.