I really like this spell thematically, I can already picture a lair seemingly grown into a dome like structure, straggling vines hang from the ceiling and an inordinate amount of flies both surround and swarm within the walls. A sickly sweet aroma bombards the senses and on closer inspection the vines appear to be secreting a sap that attracts the flies and binds them to the vine. All manner of other insects crawl along the vines, feasting on the flies and a snickering voice welcomes you in...

If only it had rules for using higher levels spell slots to target more insects.

If a Druid were to Wild shape into a scorpion. Could this spell be cast on them to enlarge them to a giant scorpion?

This spell sounds like it was made for ****** shenanigans. One of my players found this and started making a ruckus about it.

All I'm gonna say is that AT LEAST one player is getting banned before the end of my next session xD

Guess someone rolled a 1 on their Nature knowledge check. Spiders and scorpions are arachnids, not insects.  Both insects and arachnids are both arthropods, but then, so are crabs. 

I guess "Giant Arthropods" didn't have the same ring to it. Or maybe part of the spell is that it magically changes the taxonomy of arachnids.

I don't see any reason this couldn't be cast on a wildshaped druid. Though the druid could not cast it on themselves unless they were level 18.

whoaa

Hang on--is there a typo? Giant spiders have fewer HPs and a weaker attack than giant wasps, and spiders can't fly (thank god). Why do you get 5 giant wasps but only 3 giant spiders? What am I missing? 

you are just flat out wrong. giant spiders have higher hp(4d10+4) ac(14) and damage potential [bite](1d8+3 piercing and 2d8 poison on dc11 save) than a giant wasp hp(3d8) ac(12) and damage potential [sting](1d6+2 piercing and 3d6 poison on a dc11 save). what were you even looking at here?

Aha! My DM was using Giant Wolf Spider stats! This helps a ton. Thanks!

So, what happens when you drop concentration? The insect goes back to its regular size?

And the verbal commands to use the giant insects once it is on the field in combat replaces your action?

Quote from Mr_ABC >>

So, what happens when you drop concentration? The insect goes back to its regular size?

And the verbal commands to use the giant insects once it is on the field in combat replaces your action?

 I would like to know the concentration thing too. I guess the sentence with, "use an action to end the effect" is if you want a single insect to stop being giant size.

Because you can always just stop concentrating on a spell whenever you like without an action or reaction. 

The only other way you can interpret it is if you stop concentrating on the spell, the insects still keep its giant size but just don't follow your command anymore.

Heya, the first sentence reads, "transform... into giant versions of their natural forms for the duration". Since the duration of the spell is concentration 10 minutes, if concentration is broken or ends, that first line tells us the transformation(s) also end(s), since the transformation only lasts for the duration. The later line also specifies that the creatures only remain in their giant size for the duration.

As for the part about using your action to end the effect, I think you are right, it allows you to end the effect on a single creature without needing to stop concentration, but at the expense of your action. Hope this helps.

Quote from TyReg >>

Quote from Mr_ABC >>

So, what happens when you drop concentration? The insect goes back to its regular size?

And the verbal commands to use the giant insects once it is on the field in combat replaces your action?

 I would like to know the concentration thing too. I guess the sentence with, "use an action to end the effect" is if you want a single insect to stop being giant size.

Because you can always just stop concentrating on a spell whenever you like without an action or reaction. 

The only other way you can interpret it is if you stop concentrating on the spell, the insects still keep its giant size but just don't follow your command anymore.

Here's how I read it: If you use an action to revert the bugs to their original size, the spell is still up and they are still subject to your commands.  This would be useful, for instance, for ordering them back into whatever trap you were carrying them in so you have them ready for the next time you want to cast the spell.

On the other hand, if you drop concentration entirely, yes, no action is required, but the spell ends entirely and they not only revert to their original size (per the "for the duration" clause) but also no longer follow your commands.

No because you would not be able to perform the verbal or somatic components of the spell since you would lack vocal cords or hands.

My spore druid loves this spell. Zombies and skeletons and giant bugs everywhere.

Giant Insect is quite nice for Fungal Infestation too, since your poisonous bugs will knock creatures unconscious rather than kill them.   Then you come along after the fight and zombify them.

Ok actual question. Can you use this spell with a home-brewed familiar? Would it still be unable to make attacks?

Homebrew is Homebrew but RAW a Pact of the chain warlock with a staff of swarming insects or multi-classed into Droid could cast the spell on their familiar if said familiar is a mundane scorpion rather than choosing an imp of Sprite or whatever. The familiar is a lot more fragile and a lot less useful than one of the more exotic options but you could cast the spell on it and forgo one of your attacks to make it attack do it may lose its multi-attack feature depending on DM ruling since one can argue that attack in multi-attack or two separate things

Quote from TwistedSpoon >>

Homebrew is Homebrew but RAW a Pact of the chain warlock with a staff of swarming insects or multi-classed into druid could cast the spell on their familiar if said familiar is a mundane scorpion rather than choosing an imp of Sprite or whatever. The scorpion familiar is a lot more fragile and is a lot less useful than one of the more exotic options but you could cast the spell on it and forgo one of your attacks to make it attack, it may lose its multi-attack feature depending on DM ruling since one can argue that attack in multi-attack or two separate things