No when you're in a heavily obscured area you can still be targeted, it's just that enemies effectively suffers from the blinded condition when trying to see you, which means that enemies can’t see you (automatically fails any ability check that requires sight) and your attack rolls against enemies have advantage, and enemies’s attack rolls against you have disadvantage.Still wouldn't be able to target them with a spell or melee, right?
It's more like the bugs makes a 30 ft radius around you heavily obscured for everyone but you. So enemies going into the area can't be seen by any other than you practically.The bugs make you heavily obscured
Fireball works on a point you can see.I CAST MY FIREBALL SPELL!
Fireball works on a point you can see.
And only extends 20 feet into the Swarm from the edge... therefore, not hitting you.
You need 10 more feet
It wouldn't affect the swarm imo.Technically, "A point you choose" within range. A case could be made that you don't need to see the point, just guess. (So you can fireball the center of an area of magical darkness, or a Hunger of Hadar. Or an Insect Swarm.)
The real question is - would the fireball clear out the insects in its area, or would they magically repopulate that area?
I would say that even blindsight could be hindered. Blindsight via sound? Lots of buzzing going on. Blindisight via smell? Sure smells like a lot of bugs.
Agreed. Tremorsense would see through it only because the bugs are flying. Blindsight probably shouldn't see through it, because the bugs are actually there, and blindsight doesn't let you see through physical things, i.e its not x-ray vision (it just means you don't need light or eyes to see). I expect a lot of DMs would let blindsight see through it. But they shouldn't.