Radius Effect That Doesn't Go Through Walls

[TheStrange]

So I have both healing and damaging radius effect objects that I've been using sphere triggers for like a noob. Funny thing is they're actually working well for what I want them to do; however, they can heal/damage monsters that are behind doors/walls/etc.. I'm under the impression that AOEs and explosions are a topic that's been visited more than once on here. Basically, if I can get game objects to register the tag trigger within a certain radius as long as there's no obstacles blocking, I'll be good.

[terri]

you could do a second check with a raycast to see if the enemy is behind a wall

[TheStrange]

you could do a second check with a raycast to see if the enemy is behind a wall

How would I go about doing that in all directions and grabbing multiple monsters at once, while also damaging some without damaging others?