(Made a Reddit account just to tell the world about this.)

I'm sitting on a Discord server one day, looking for DM's who are wanting players to scratch my DnD itch.
I found someone looking for players to go through a story for the DM, they make it seem like they have ran a group through this before, some homebrew elements apply.
I get accepted, first person in, join a VC with the DM and start going over character creation.
Starting with class, I 'want' to play Warlock, so I ask.
"What Warlock subclasses am I NOT allowed to use?"
"I don't want any Hexblades."
"Okay, Genie is okay then?"
"No Genie."
We have a back and forth for a while, I find out that they've banned all of the Tasha's book, and only lets me do Archfey or Fiend with the pretext I may have to change if they deem it 'too powerful'.(I will later choose Fiend, but for now.)
"What about Artificers?"
"I have removed all Int casters."
"So... No Wizard? Arti, Eldritch knight, Arcane Trickster?"
"No, none of them exist."
"Alright so how to Patrons work for Warlock?"
"You basically worship them."
"So, Warlocks are basically Clerics?"
"Yes."(It's at this point I go Fiend Warlock.)

Next up is Race, I have a few ideas flowing at this point. Ask for Yuan-ti, get shot down, no monster races, no exotic races, base only. (Minus that 10 minutes later they let a player who also joined VC play Aarakocra.)
Go Tiefling, but before we continue we have to go on a very important tangent.

Casting spells.
No spell slots, no spell points, you have mana...... certain level spells cost a certain amount of mana.
The amount of it you have is based off your Wisdom or Charisma. (For anonymity's sake at the moment let's say my character ends up with a lot of mana for reasons we will discuss later.)
Casters know all their spells...... yes..... all of them..... your only limit is if you have enough mana to cast the spell, meaning my character can currently cast 1 7th level spell with all their mana.... at level 1.
And before you ask, yes, cantrips cost mana, enough that my character is limited to 20 cantrips by their mana pool, even with the large amount discussed earlier.
As far as I am aware, Warlock gets no bonuses to mana regen probably because all of the casters work on the same system.

Back to where we were.
"So what Tieflings can I be?"
"Base, no sub-races."
"Ooookay, so, how does casting Tiefling feature spells work on the mana system?"
"What are the spells you get?"
"Well, Thaumaturgy, which you have banned, and then Hellish Rebuke."
(Yes.... there is a banned spell list, we will get to it later.)
"I'm not giving you Hellish Rebuke."
"Are you... banning it or?"
"No, you just don't get it as Tiefling."
"Okay that leaves Darkness at level 5, oh, and are you going to replace these spells you're telling me I can't have?"
"No, and we'll cross Darkness when you hit 5."
"Oh.... Very well."

Moving on to stats, we start with a point buy, all stats at 8 and we get 45 to spend.
-Putting points to get 14 or greater does not cost 2 instead of 1 like point buy normally does.
-We can cap stats at 25
-Max for all stats is 30
-HP is your Con stat, not the modifier, multiplied by 10 (200 for me, tanky Warlock is go)
-Mana is your Wis or Cha multiplied by 15 (Meaning 300 mana)
Even out my other stats, don't want to go full into 25's and have low others because I have no clue what i'll be facing.
All of us start with the Noble background plus one background we wish, benefits of both, however our only equipment is 50gp and clothes. (Later it seems he did not tell this to the others, as in session 1 the other characters had equipment and I don't even have a spell focus.)

Banned spells.
With all that out of the way, I can get to the part where I don't rail on the situation, and instead rail on previous decisions by the DM.
To name a few, this is by no means all the banned spells.
Thaumaturgy, Spare the dying, Legend lore, Counterspell, Heat metal, Guidance, Revivify, Divination, (Not specific that's just what the list says) Find familiar, Unseen Servant.

To add to this, it's apparent that the DM has some precious NPC's that they don't want the players to mess with because also on the ban list is. Mind control, Geas, feeblemind, and both forms of polymorph.

At the moment that's all I have, I haven't asked about druids, clerics, or Sorcerers yet, and since we've done session 1 nothing major has come up, i'll keep you all posted.

Bonus note: They showed us an attack from a monster the gods can send at us, it did 80k damage as a test attack.

Session 2 out now: https://www.reddit.com/r/rpghorrorstories/comments/klirao/ban_list_a_mile_long_session_2/