We have minor changes to the balance and AI behaviour (competition for magical artifacts may be a bit more acrimonious), and a few minor details have been changed/added. Let's start at the beginning...


Source trait rework

All sources have been merged into one trait (except Yaga's Blood, which has remained separate but no longer counts as a source i.e. does not unlock Arcane Focus). In fact, the Unstable Source and Chosen One trait still exist as separate traits, but this is a temporary way to avoid insta crashes when loading older saves. These traits can no longer be acquired other than with the console (and even then they may not work properly). They will be removed completely in the future.

Now source trait has two 'XP tracks' that define the type of this source.

• Instability - This value is always 0 at the beginning, but between the ages of 5 and 7 it can rise dramatically. A source with more than 30 instability is considered unstable, and can cause Magic Eruptions, as I wrote about previously. Stabilising a source is now more of a process than a single action.
  
• Magic Potential - This is the innate talent to use magic and a measure of the strength of the source. This value is determined at birth, and is mostly random, although various factors can influence it (for example, the potential has a chance to be a little higher if both parents have sources). The magic potential may increase a little during childhood or during source stabilisation, but will generally not change significantly over a lifetime. If you were born with a weak source, it is likely to stay that way. Most sources have a medium or low potential - you should be happy if you have 60+, and sad if it's less than 20. The highest levels (80 - 'Powerful Source' and 100 - 'Chosen One') are almost unattainable.

Cyrographs

I wasn't entirely satisfied with the way the demons get their Hell Powers. Now demonic XP will not grow passively over time, demons have to earn their powers. 'Propose a Cyrograph' is a new interaction available to each demon. In this way, a mutually beneficial (let's say) contract can be made between a demon and a mortal.
As a result, the latter receives immediate access to magic (i.e. unlocking Arcane Focus) either a source trait or an increase in magic potential. The exact benefits of the deal depend on the demon's strength - mortals with high diplomacy can negotiate slightly better terms as well.
What profit does the demon have? Of course, he receives the mortal soul, although it is useless as long as the mortal body is still alive. The contract is signed for a certain period of time (10, 20 or 30 years) after which the demon has the right to send the mortal to hell. Only then the soul can be consumed and turned into Hell's Power XP.
Of course... you can sign the contract and kill the mortal immediately afterwards, but technically this is breaking the contract, so you will receive much less XP.
Despite the promise of power, not everyone likes the idea of ​​selling their soul. Ambitious characters, power-hungry witches or corrupt rulers may be interested in such a deal.

Cyrographs can be important even if you're not playing as a demon. Who knows, maybe one day some demon will make you an interesting proposition...


Grand Coalition

A new ending crisis may arise, although it is different from the others - this time you do not have to fight supernatural forces. As you conquer more lands with the help of magic and cunning, the other rulers don't have to watch passively. They can unite and declare war on you together to stop the threat.
The crisis begins with an ultimatum you get from the chief witch-hunter - prison and witch trial or war. If you refuse, this war ('War Against the Witch') will start some time later and any ruler not involved in the wars, who does not have a truce with you and is not your ally, can join it on the side of the hunters. In many cases it will be a struggle of you versus the rest of the world.
The stakes of war are high. Your defeat means you will lose your magic items and be burned as a witch. Most of the adult members of your house will be imprisoned and will have to go through a witch trial. Your Coven will be shattered. If you win, the world will have to recognise your place in history as a great ruler and all faiths will increase their level of acceptance of witchcraft.
Setting hunter activity to low will disable this crisis.
BTW you also may sometimes launch the Grand Coalition war when you play as a witch hunter - via Stop the witch interaction.


Other stuff

• Witch Hunters can sometimes turn into Fallen Witch Hunters and start practising witchcraft. This also happens automatically if they become corrupt.
  
• The bonus to reduce the cooldown of magical research has been moved from Research Cooperation (a temporary modifier) to the Academy of Magic (a place of power). Other places of power have also received improvements.
  
• Power Strike interaction can no longer be used to force a mage duel or against a magic user. But the Mage Duel interaction now has the option to force a duel even if the other party disagrees - physical contact is required here, however. Well, and unless you are at war with each other, such an action is considered very dishonourable.
  
• I have rewritten the system for triggering crises - in result we have a new game rule to delay their arrival - you can simply set a period of time when crises will definitely not occur. The default setting (At any time) does not mean that a crisis can trigger immediately at the start of the game - as before, you have to meet the crisis conditions for it to start. I have written a bit about the conditions here.
  
• Grand Rite always restores Power Saturation if it is held in a place of power. Otherwise there is only a 50% chance.
  
• Magic Catalyst no longer increases the bonus to Power Clash (mage duels were too easy). Instead, its bonus from collecting power saturation has increased from 50% -> 100%.
  
• There are some small changes and tweaks.

Everything I have written about above may need to be adjusted, so some parameters/mechanics may change in the future.
That's all from me. Let me know if you find any bugs, and good luck ;)