Can a high level warlock with Book of Ancient Secrets learn ritual spells higher than 5th level?

Let’s say I’m an 11th level Pact of the Tome Warlock with Book of Ancient Secrets. I’m able to learn spells to cast as rituals from any source, I can transcribe spells up to half my level rounded up, and have just gotten my 6th level Mystic Arcanum.

I do not actually have 6th level slots, but ritual casting doesn’t use spell slots anyway, and I am capable of casting 6th level spells (or at least one). Am I able to transcribe a 6th level ritual spell, or am I capped at learning 5th level rituals?

Making the Ancient One from Dr. Strange [closed]

After seeing her in action in the movie, it looked like a fun character to try and make. Though, despite being called the sorcerer supreme, she feels like a variant of monk (with the magister template from Faerûn) while Strange himself is more of a wizard.

So, what would be the best direction to start for a melee/conjured weapon character that can port around on this plane and others, as her situations require? Sorry to be a nuisance if this or similar post has been asked already

What is the highest armour class possible for an Ancient Green dragon?

This posts asks what the highest armour class may be for humanoids. Similar to this question, i would like to know what the highest AC would be for a monster. Narrowing this down, let us look at improvement techniques possible for an ancient Green dragon. As this is a BBED (‘Big Bad Evil Dragon’), they most likely have a slew of minions, guardians and servants – so please feel free to use any options that exist (in 5e) that may be spells, minions, a spare shield guardian, or anything else you like.

For stats on the ancient Green dragon, has a base dexterity of 12 and a base AC of 21. I do not know if it could gain NPC levels of monk or barbarian, nor what use that would have. We can assume this dragon has the ‘optional’ spell casting abilities. According to old (possibly 3.5e) Forgotten Realms material these creatures are a minimum of 800 years old at ‘ancient’ and may live until past 1,200 years or more. They seem to have access to a lot of magic items. These things are gargantuan, so i have no idea, for example, what size shield they would need – or even if a shield works for them. I don’t even know how big ‘cover’ would need to be in order to offer 3/4 protection. Would a Cloak of Protection even fit? I have specifically left this quite open as i would greatly value any and all possibilities that Stack Exchange has to offer.

Let me know if this question is specific enough. The original (above) was seemingly less specific, but Stack Exchange seemed to be enjoying a different mindset at that time.

Question Recap: What is the best armour class possible for a 5e ancient Green dragon – assuming any & all options are available to it.

Who were the Ancient Baatorians?

Manual of the Planes (2001) says

Though the Nine Hells is governed by devils, some sages believe that the devils commandeered the Nine Hells from a far older, stranger race now simply called ancient baatorians. It’s possible that remnants of this mysterious race still inhabit isolated portions of the Nine Hells. (116)

Further, Malbolge, the sixth layer of the Nine Hells, on the cavern Maggoth Thyg says

Rumors describe ancient places built underneath the slopes of Malbolge. Below the hellish rock and stone, creatures older than the devils themselves—the ancient baatorians—might still roam. (121)

Did Wizards of the Coast ever describe the ancient baatorians, and, if so, what are they?

Casting spells using the Book of Ancient Secrets

I am playing a 3/3 Divine Soul Sorcerer/HexBlade Warlock, and have just chosen the Pact of the Tome, along with the Book of Ancient Secrets.

I have found a spellbook with Identify, which I am now transcribing into the book. I also have Unseen Servant as a known spell. I create a scroll, using the Arcana skill. And then use the scroll to transcribe the Unseen Servant spell to the Book. The Scroll is destroyed in the process. So far, so good.

I then replace Unseen Servant with Charm Person on my list of known spells.

Can I still cast the Unseen Servant as a ritual from the book?

Can I cast the Unseen Servant as a spell, using the book and a spell slot? This question arises from the interpretation from the text “You can’t cast the spells except as rituals, unless you’ve learned them by some other means.

If this is possible, it basically means I have an external memory extension, that when held, allows me access to cast any of the entries as a ritual.

And cast the spells that previously were known spells from my spell list that has been transcribed into the book, as spells, using spell slots.

How do Eberron Dragonmarks and Book of Ancient Secrets Invocation interact?

I might be over-analyzing and confusing myself, but I’m not certain regarding the interaction between Dragonmark learned Ritual spells and the Book of Ancient Secrets warlock invocation.

Let’s take as an example the Mark of Hospitality subrace’s trait:

Spells of the Mark. If you have the Spellcasting or the Pact Magic class feature, the spells on the Mark of Hospitality Spells table are added to the spell list of your spellcasting class.

This list includes ritual spells like, Leomund’s tiny hut, Mordenkainen’s private sactum and hallow.

Now let’s take the Book of Ancient Secrets invocation:

You can now inscribe magical rituals in your Book of Shadows.[…] You can also cast a warlock spell you know as a ritual if it has the ritual tag.

On your adventures, you can add other ritual spells to your Book of Shadows. When you find such a spell, you can add it to the book if the spell’s level is equal to or less than half your warlock level (rounded up) and if you can spare the time to transcribe the spell. For each level of the spell, the transcription process takes 2 hours and costs 50 gp for the inks needed to inscribe it.

In order to ritual-cast these spells (added to my list by the Dragonmark) as non-prepared spells, but rather as ritual spells from my Book of Shadows, which of the following mechanism is appropriate, per RAW (and/or RAI):

  1. Do they count as warlock spells (by being added to my spell list as per the spells of the mark trait), thus I can cast them without preparation since they have the ritual tag (as per the Book of Ancient Secrets Invocation?)
  2. Do I magically learn them (as per the spells of the mark trait) but I have to spent time to transcribe the spell in the Book of Shadows, although I don’t have a physical written form of the spell?
  3. It does not satisfy either mechanism, and the only way to cast these spells is to prepare them as warlock spells, until I find them in written form and can transcribe them in the Book of Ancient Secrets?

Should I have to roll to copy a spell into my Book of Ancient Secrets?

The Book of Ancient Secrets invocation says (PH p. 110):

On your adventures, you can add other ritual spells to your Book of Shadows. When you find such a spell, you can add it to the book if the spell’s level is equal to or less than half your warlock level (rounded up) and if you can spare the time to transcribe the spell. For each level of the spell, the transcription process takes 2 hours and costs 50 gp for the rare inks needed to inscribe it.

There’s no mention of rolling anything.

But in the DMG (p. 200) under the Spell Scroll magic item it says:

A wizard spell on a spell scroll can be copied just as spells in spellbooks can be copied. When a spell is copied from a spell scroll, the copier must succeed on an Intelligence (Arcana) check with a DC equal to 10 + the spell’s level. If the check succeeds, the spell is successfully copied. Whether the check succeeds or fails, the spell scroll is destroyed.

This entry refers specifically to wizard spells, and seems to be more directed toward wizards copying wizard spells into their spellbooks, but since warlocks can copy any scroll that would also include wizard scrolls.

I’ve copied one spell already in our campaign, and the DM didn’t call for a roll, which is fine with me, but I’m just wondering if anyone knows what was intended.

Can i dimension door ONTO the back of, say, an ancient green dragon?

I am familiar with the DMG rules for climbing on to the back of a larger creature, and I think that dimension door or perhaps misty step would allow me to bypass the Opposed dex vs str/dex check, to place myself onto its back. From there, it can use its action to shake me, or whatever the dm can come up with, mostly im curious about rulings for teleporting ONTO a creature. Certainly the place it is is occupied, but im not trying to land there. What say ye, oh wise masters?

Can I true polymorph into an Ancient Brass Dragon, and then use its Change Shape ability?

If I were to cast True Polymorph (which permits all creatures, not just beasts, as the regular Polymorph does) on myself to turn myself into, say, an Ancient Brass Dragon (provided that I’m level 20, which is required due that dragon’s CR) – could I then use the Change Shape “racial” feature of the dragon?

Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form…

True Polymorph:

Choose one creature […] that you can see within range. You transform the creature into a different creature, […]. The transformation lasts for the duration, or until the target drops to 0 hit points or dies. If you concentrate on this spell for the full duration, the transformation becomes permanent.
Shapechangers aren’t affected by this spell. […].

Creature into Creature
[…] The target’s game statistics, including mental ability scores, are replaced by the statistics of the new form. It retains its alignment and personality. […]

I can’t find anything in the spell that would prevent one from doing so. The only thing that might come into play is the phrase “Shapechangers aren’t affected by this spell”. You as the caster are not a shapechanger, however, so even though you transform into a shapechanger, you aren’t when you cast the spell.

How does the Commune spell work when cast by someone with the Ritual Caster feat or a warlock with the Book of Ancient Secrets invocation?

The D&D 5e spell Commune is a Cleric spell that contacts the Cleric’s chosen divine proxy and asks them three ‘yes or no’ questions. It is a ritual spell, so a Warlock with Book of Shadows or anyone with the Ritual Caster feat really can learn and cast the spell.

Let’s say an atheist wizard uses the Ritual Caster feat to learn Commune (gaining Ritual Caster does not require belief in any pantheon) and then casts it (which can be done through an arcane focus). Who would she encounter? (If it helps, the Wizard belongs to the School of Divination.)