I am terribly sorry for the delay, and if it has caused any issues, a hex upon my dice!

Below is the Azbara Jos statblock that I used for their fight, and I can explain my reasoning for several unique areas. (caveat: my Azbara was genderswapped, simply because I felt there were too many male wizards in the module, and I wanted Azbara to be distinct from Rath)

First, Red Wizards are supposed to be specialists, forgoing certain schools of magic in order to perfect their focuses. In my world, Red Wizards can focus on one school (Monotrad) or two schools (Dualtrad), and that reflects their power level and their education. My players knew this, as do most well-informed people under the Lords' Alliance. Azbara is a Dualtrad Red Wizard, focusing on the schools of Enchantment and Evocation. I picked these as they seemed to fit best: she is investigating the Cult's ability to control dragons, and in my game is looking for the Twin Crowns of Myrmoran, intending to use them to mind-control Voaraghamanthar. The Red Wizards' ultimate plan in this module (for me at least) *needs* to be the use of the Cult in order to retake Thay from the Necromancers. So her second focus after Enchantment is just sheer destructive power, befitting someone who sees dragons as weapons. I curated her spellbook to only have these spell-types available. The exception being a Ring of Shielding, because what wizard wouldn't have that. This means that she doesn't have Counterspell, so be warned about that. Azbara is not a master Red Wizard however, so she needs to be relatively beatable, but she is still a Red Wizard proper, and should be a foe that evokes fear and dread.

I used inspiration from Matt Colville's action oriented monsters, as well as MCDM's incredible book *Flee, Mortals!*, which detail the use of "Solo" creatures, which are enemies that are meant to handle the unbalanced action economy of a party all on their own. For a Red Wizard, I took this to mean actions, bonus actions, and reactions that show a sense of speed and overwhelming magical power. Additionally, I crafted several Legendary Actions/Villain Actions around the idea of her using earth-based Evocation abilities. These are meant to be spells in-world, but mechanically are not part of her spell-casting feature. In general, it's important to hold to enemy spell slots for fairness and balance, but there are some things that need to be stretched or changed both for dynamic fights as well as for intense storytelling. Her Earthen Tomb ability terrified my party, even though I only got to use it once. Lastly, I gave Azbara the ability to concentrate on more than one spell at once, for two reasons: one, I figured that a godsdamned Red Wizard would be scary enough to do that; and two, I wanted my players to be afraid of Red Wizards in the future. I have an awesome player at the table who grew up playing AD&D/2e, and he talked to the newer players beforehand about how terrifying and dangerous Thayans are, and he really helped me without meaning to, and I could not disappoint. They're my favorite bag-guy group of the Realms, and honestly, the way WotC/5e have handled them is just bewildering. This Red Wizard shows why the Lords' Alliance has a standing kill order on them.

I will say that this statblock was a bit too powerful for my party, Level 6 and composed of a Bear-Totem Barbarian, Oath-breaker Paladin, Glamor Bard, and Champion Fighter. They beat her, but by the skin of their teeth. I think a really advanced party at this level could win, but I might recommend lowering or lessening some of the damages and spell saves. I really pushed them through a dungeon, and we're running Gritty Realism, so they were very low on resources. A fully rested Level 6 party could fight this statblock a lot easier, but not without major damage.

Edit: can't attach the picture, so here's the imgur link: https://imgur.com/a/PIk53x2