Sure, some of those make more sense. But, why do you need bonus action invisibilty and action flight? Bonus action invisibility and action resistance?
Cube of Force seems like it doesn't really need invisibility.
It just all... seems so circumstantial.
Its the fact that you can do these multiple things from the instance the fight starts. Invisibility is a great defensive buff and having it stay as long as possible while getting good actions out of it is another example of pushing your spells further.
I've tried to justify Phantasmal Force a few times. 1 minute of an illusion is not a lot, and again, a DM should require a check. Phantasmal Force is not as powerful as you seem to want it to be.
I mean, if a DM does determine that the investigation check is necessary, they still need to succeed on it. If they don't, they're still convinced it was real.
A minute of illusion is enough for a brief interaction, usually.
Deafening them is a terrible plan. And mage hand only lasts a minute, so if you are following a mark... you can't use it. There would be a lot of ways that this would fail utterly, if there wasn't some assumption that you could cast a spell in a crowded marketplace without everyone in the place noticing you.
Arcane Trickster Mage Hand wasn't anything meant to be the star 3rd-level feature. The spellcasting is the important subclass feature. Invisible Hand is just a nice bonus, so its not always useful all the time, but its useful at least sometimes, and its a nice bonus.
Sure, it should have some effect, but if you are trying to pretend that his wife just came in, and he's holding a conversation with himself, and no one is going to question it, then you've kind of gone too far.
There is a very limited set of things you can plausible have him react to, and even then, I'd
If you houserule a spell such that you need to make an ability check even though they already failed the initial save, you're being unjustly unfair to the spellcaster that expended a spell slot, sorcery points, and still had a percent chance to have the spell do nothing.
But if it does fail, you can always just go "huh, weird. Maybe it was something you ate," when they question things. They don't have any proof anyone casted a spell so the target going crazy is just as likely. And not all sorcerers are wearing their cosplay robe and wizard's hat in-character so they could easily just look as mundane as anyone else. In fact, having Disguise Self to look like an appropriate nonmagical character and cast the spell could be perfect forms of manipulation or sabotage.
Why are spell slots so cheap in these discussions? Does no one value actually having spell slots in these discussions?
People always act like converting spell slots to points is a painless endeavor with zero cost to the sorcerer.
I did say it was foolish if you did this. But I also want to say that 2-4th level spell slots are pretty plentiful at a combined 12 of them just sitting in your spell slot table. Even if you spare one of each
just in case, you've made an additional 18 sorcery points, which should be more than enough with quite alot of spell slots left over.
Of course, this isn't something you must do at the start of the day. It could just be at the middle of the adventure, filling up your points as you need.
You present the question incorrectly.
"Is getting another fireball now worth spending the resources I might need later, or am I better off with not casting fireball and saving these spells for unknown challenges?"
That is a far more complex question.
Its the same question, just worded differently. I use
need in an almost literal sense. Is the game going to be seriously negatively impacted if another fireball isn't thrown? Could a TPK be on your hands if more fireballs need to happen? If yes, you should use it because you'll never get to use those reserved spell slots if you die before that time. If no, you should wait and see more.
Of course, "fireball" can be replaced with any spell of your highest restricted level from levels 3-9. It isn't about fireball in particular, its about the spell slot and whether you have it and need it or not.