After beating the AI into submissive pulps, I let a couple of them live to play around and explore everything the game had to offer me. Noticed a few bugs while I was goofing off waiting for my family tree to expand. And playing around with spells I never learned before like flood and volcano. I'll put in some screenshots when I get around to hosting them.
1. [Dynasty Bug] Grandchildren in your dynasty can marry one another, cousins or even siblings.
2. [Dynasty Bug] Grandchildren of a dead faction in your dynasty can still switch over to the non-existing faction.
3. [Spell/Graphical Bug] Flood has some cloth map bugs, maybe even regular map bugs where resources in flooded lands float in the newly created ocean.
4. [Spell Bug] Same thing happens to forests, the monsters dying on the initial cast only to spawn and be stuck in the ocean.
5. [Script Bug] You don't get credit for destroying a faction when casting flood/volcano on their last remaining city with the sovereign inside it.
6. [Graphical Bug] Volcano has no cloth map graphic.
More detail below
Dynasty Bugs:
1. Grandchildren in your dynasty can marry one another, cousins or even siblings.
I noticed when you have grandchildren, some of them may join the faction of their other parent. Which leads to the first major glitch I ran into. The grandchildren that stayed inside your faction can marry the ones that left it. Bringing them back into the family to have kids with. I first did it with cousins on purpose since I was a little upset at the "betrayal" and wanted them back by any means necessary. Was kinda shocked that it worked, but thought nothing of it. Then somewhere down the line the same exact thing happened with SIBLINGS which I did by accident since I wasn't paying attention to the names. When the two are married you see doubles of them in the Dynasty tree. And when they have kids only one "pair" of their doubles gets the kids. As far as I see the doubles don't have repeat kids or any kids for that matter.
2. Grandchildren of a dead faction in your dynasty can still switch over to the non-existing faction.
If your kid marries someone in a defeated faction, the grandchild can be born under the faction that nolonger exists. I ended up with the Queen of a non-existant Umber. She spawned in my capital city, standing there doing nothing. I got to chat with her and sign a peace treaty to end the war they already lost. Cheesing some easy gildar and diplo points. When talking to her she didn't show up on the screen, it was just an empty room with the chatbox. I also noticed under the dynasty option you could still marry her even though she was the new soverign of umber. I never got to try that out since the faction hated me for wiping it off the map I guess. Went to war with her again and killed her easily, there was no repeat "Faction Defeated" message.
Spell "Flood" bugs:
3. Flood has some cloth map bugs, maybe even regular map bugs where resources in flooded lands float in the newly created ocean.
After I learned this spell the first thing I wanted to do with it was flood all those useless peninsulas my borders didn't overlap yet. Cleansing the world of all the "dead" lands so that everything was either green or water. Seems like even though the land is an ocean, resources still float in the water still remaining on the map.
4. Same thing happens to forests, the monsters dying on the initial cast only to spawn and be stuck in the ocean.
I flooded an annoying forest right next to one of my cities and monsters still spawned ontop of the water. The spell killing them like it should've. Then one turn later respawns pop up stuck in the ocean.
5. You don't get credit for destroying a faction when casting flood/volcano on their last remaining city with the sovereign inside it.
Curious I casted this spell on one of the remaining factions. It destroyed their city like I thought it would. It even killed their sovereign, and since there was no cities for it to respawn to it ended the faction. But I didn't get credit for the faction kill, it said something like [FactionNameHere] has destroyed the Tarth, bla bla blah.
Spell "Volcano" bugs:
6. Volcano has no cloth map graphic.
Unlike Flood, this spell actually did it's job when casted on resources. Destroying them even if they were already built on. But it doesn't have a graphic on the cloth map. It's just an empty space that can be confused for flat land.