Gaseous Form

Does earthbind completely wreck this spell or just me? 

Quote from Dangerdane >>

Does earthbind completely wreck this spell or just me? 

Earthbind would stop someone in Gaseous Form from moving, but that's all. And the gaseous person would have advantage on the save vs. Earthbind.

You'd think a Gaseous Form would be immune to being Grappled? If you can traverse through narrow openings, surly it could slip through the fingers of a Barbarian that doesn't respect personal space, right?

Quote from Aether_Veilborne >>

You'd think a Gaseous Form would be immune to being Grappled? If you can traverse through narrow openings, surly it could slip through the fingers of a Barbarian that doesn't respect personal space, right?

You'd think, yeah, but I guess technically no. They would at least have advantage on the save to avoid being Grappled (because it's either Strength or Dexterity, and being gaseous gives you advantage on both).

poorly written and developed spell

*you can still be attacked and grappled but you cannot make attacks yourself?

you can slip through spaces but can be grappled?

*there's no mention of your mass/density changing except for the fly/walk on water thing, of description as to whether your size changes?

you still need to breathe? once again no mention of being free from basic breathing etc

how do you interact with spells like gust of wind etc.

Up your game developers, this is slop.

This spell should have been 2nd level tops. It's ok for scouting but there are lots of better options for that.

Can I use reactions while in gaseous form? Specifically, can my Circle of Spores Druid use the Halo of Spores reaction to deal some damage (or even 2dx with Symbiotic Entity boost)?

Gaseous form says "Finally, the target can’t attack or cast spells."
Halo of Spores: "Action Type: 1 Reaction" ..

So Halo of Spores seems to be an Action that deals damage, but is neither an attack, spell cast nor doing physical manipulation to an object. I understand this more like mentally controlling another creature (hence Symbiotic Entity, which implies two creatures are involved), just as controlling a zombie.
So, can I fly around in Gaseous Form while using Halo of Spores, Stones Endurance (i am a Goliath), Fungal Infestation? If not so, why?

Halo of Spores rule text from TCOE for reference: 

You are surrounded by invisible, necrotic spores that are harmless until you unleash them on a creature nearby. When a creature you can see moves into a space within 10 feet of you or starts its turn there, you can use your reaction to deal 1d4 necrotic damage to that creature unless it succeeds on a Constitution saving throw against your spell save DC. The necrotic damage increases to 1d6 at 6th level, 1d8 at 10th level, and 1d10 at 14th level.

 Goliath Stones Endurance for reference:

Stone’s Endurance (Stone Giant). When you take damage, you can take a Reaction to roll 1d12. Add your Constitution modifier to the number rolled and reduce the damage by that total. 

 Fungal Infestation for reference:

Your spores gain the ability to infest a corpse and animate it. If a beast or a humanoid that is Small or Medium dies within 10 feet of you, you can use your reaction to animate it, causing it to stand up immediately with 1 hit point. The creature uses the zombie stat block in the Monster Manual. It remains animate for 1 hour, after which time it collapses and dies.

In combat, the zombie’s turn comes immediately after yours. It obeys your mental commands, and the only action it can take is the Attack action, making one melee attack.

You can use this feature a number of times equal to your Wisdom modifier (minimum of once), and you regain all expended uses of it when you finish a long rest.

Quote from zausel3000 >>

Can I use reactions while in gaseous form? Specifically, can my Circle of Spores Druid use the Halo of Spores reaction to deal some damage (or even 2dx with Symbiotic Entity boost)?

Gaseous form says "Finally, the target can’t attack or cast spells."
Halo of Spores: "Action Type: 1 Reaction" ..

So Halo of Spores seems to be an Action that deals damage, but is neither an attack, spell cast nor doing physical manipulation to an object. I understand this more like mentally controlling another creature (hence Symbiotic Entity, which implies two creatures are involved), just as controlling a zombie.
So, can I fly around in Gaseous Form while using Halo of Spores, Stones Endurance (i am a Goliath), Fungal Infestation? If not so, why?

Yes. The spell explicitly lists the things you can't do while under its effect: attack, cast a spell, speak, or manipulate objects. The Reaction granted by Halo of Spores is none of those things, so you can do it.

Fungal Infestation and Stone's Endurance likewise are not any of the things the spell says you can't do, so you can do them.