(assuming 5e or newer) You can’t true polymorph into Tiamat. The ‘aspect of Tiamat’ from Fizban’s is already CR 30, Tiamat herself is unstatted but obviously more powerful.

As a player character, you can only True Polymorph to a creature of CR 20 or lower

totally unrelated time in the screenshot, I’m sure

That is what ‘automation’ often is. You take a working process, then let machines do as many steps in that process as you can. Harvesting crops, sending memos, robots spraypainting car parts, self driving cars (We still have a lot to do there)

Building on that it gets even more interesting as we try to find better, or even completely new processes.

I can only say that in my experience, it works ok.

The current app is pretty useful. I can

• access all the content that I have bought on dndbeyond
• view the player characters that are playing in my campaigns
• play my own character(s) as a player, including dice rolls if I want. For major changes to my character it redirects to the website, but it handles all common in-play updates directly in the app (hit points, conditions, inspiration, equipment, preparing spells etc)

Be aware that you can purchase new content in the app or on the website, and the prices may differ between the two. In my case, the app uses Euro prices including VAT, while the website uses USD prices where the Sales Tax/VAT will be added on checkout. Most promotions will only work on the website.

To have one entity that controls all three(+) factions, they must have a goal that is not depending on the success or failure of any faction – it will most likely depend on the fact that there are multiple factions opposing each other. Who is gaining anything from chaos and discord? There are several candidates present in the book:

1. Captain Xendros. She is essentially a foreign agent that cares only about fish for her country, and magic items.
2. Keledek. Just like Xendros, he uses the smugglers to get access to magic items, but he gains security by having a strong-ish government that protects his property.
3. Granny Nightshade. The more inner struggles Saltmarsh and Keoland have, the less they will bother her. The Brotherhood can be a good tool for her to keep the power of the others in check.
4. The Sea Princes. Although the loyalists hate them, supporting this faction will keep the smuggling operations more profitable, and the princes may also get insight in possible Keoland secret plans through the loyalists. The Brotherhood gives the princes a tool to kill their adversaries in all of Keoland.

Another option that I have thought about is Xolec. Maybe he is connected to other vampires like Strahd? Then there may be Vistani involved as messengers?

You are wrong, till is perfectly fine – and so is til. See Merriam-Websters article about this, at https://www.merriam-webster.com/grammar/should-you-use-until-or-till-or-til

There was no question in the post. I’m pretty sure that poster knows what “word size” is in this context.