Mistwell
Crusty Old Meatwad
If its the edge, then why do people in the middle get hit?
The radiation analogy is apt, or simpler, a bonfire. if being in a fire only burns you once, going in and out of the fire won't burn you twice.
The spell is also good enough as is without the cheese.
We're just guided by what the spell says. As you enter the field, they attack once forcing you to try and resist with your wisdom or take radiant or necrotic energy damage. If you stay in the field for 6 seconds without leaving, they attack as well. Given it's spirits which appear angelic, fey or fiendish, I just assume these are the orders they're operating under when summoned into such an emanation. Most of the attackers flit on the edge of the emanation, but can dive in briefly if something chooses to stay in the emanation.so what is you stay exactly at the edge of spirits for 6 seconds?
how many instances of damage should you get?
There are certainly weirder mechanics in the game which make less sense than that.