I don't know if Illyriad has been mentioned or not but I like that one though I haven't tried many other Idle games. I'm not sure if it meets the definition except that it's a browser game and build times become hours and days on buildings in your city and armies and spies can take days real time to arrive where they are sent to.
There is even a B12 alliance called Slaves to Armok. I'm currently only logging in to refresh the sitter status of the accounts but once I get a decent phone (which I postponed as I need a new phone less during a pandemic tbh) I'll use that to check it on work breaks and while watching ball games and whatnot.
You pick a species, the main difference is that their best military and consulate units are different. For example, orcs have better spear troops, dwarves infantry, humans cavalry, and elves archers and the troop types all prefer different terrains statistically. You start with a single city that you upgrade with basic resources. Eventually you can move that first city somewhere else for free so you can find a spot outside the newbie area. Established players are very generous with new players through sending caravans with resources, to the point that standard advice is to upgrade the storage buildings first so they can fill the resources for construction repeatedly (which costs them essentially nothing except caravan travel time as their basic resource income will be very high). Likely they might send the gold resource, which they will have a lot of as there is no storage limit. Gold would allow you to send caravans to a nearby player supplied market hub and purchase the resources to supplement the resource caravans established players enjoy sending to new players.
Considering the game is has heavy pvp elements such as being able to completely siege and remove all of a player's cities and force them to start over, it actually is quite pleasant as far as that goes. It was rare when I was playing actively to see aggression except between rival alliances, as being overly aggressive towards the less established was a signal to more powerful alliances and coalitions that you were fair game. Instead, there are frequent tournaments in which alliances compete to hold tournament squares, sending hundreds of thousands of troops to dislodge and then hold the square for as long as they can. StA has done well for the size of the alliance in some of those.
It's free but there are some things called Prestige Points that are purchaseable that allow instant building which once the build times are hours and days saves a lot of time. Every player receives 1 prestige point a day IIRC if they click on a button to claim it, but they can be purchased in bulk with real money to rapidly construct a city. I bought some many years ago and gave it to the alliance for people to pull from (I can't remember if I set a limit but I think it's a certain amount per period of time) but I haven't checked to see if there is any left or not.
As to multi accounting, you can have 2 accounts as a limit and neither can be geared towards supporting the other I think but I'm not sure or how that's interpreted. You can also be assigned a sitter to an account by someone else, which means you can take control of it for them for 90 days at which point it must be refreshed. This is to prevent your account from being stale, after which it is removed from the game after a short period IIRC. I lost one of my accounts because I goofed assigning sitters once, but on the other the sitters have been excellent and have kept it going. I'll remake the other one with prestige once I start Illy again.