Battlefield Duels:

In vanilla battles, knights and commanders have a chance every day of being wounded, maimed, or killed. If this chance fires, the game chooses an enemy knight with sufficient prowess and gives them the credit for having done the deed (prestige and a chance of increasing prowess or gaining a level of the Blademaster trait).

In this mod, those chances still exist for being harmed by common soldiers, but they've been reduced and the probability room is instead assigned as a chance every day for a knight or commander (whether player or AI) to start a single combat duel against a knight or commander from the opposing side, if one is available and not already engaged.

Bolder and more energetic characters (not just with the Brave trait, but any trait that increases the boldness/energy personality stats) are more likely to get these opportunities, as are more zealous characters when fighting religious enemies. A game rule is also included to make them more or less likely. Performance impact seems minimal even at high probabilities, but I haven't tested with lategame megabattles.

In order to let players participate in this more, player characters who are vassals are now eligible to be picked as knights or army commanders for AI lieges, where it was disallowed before. If your liege is at war a lot, this may mean your character is busy a lot: if this isn't ideal, perhaps consider whether any potential replacement lieges might be less warlike!

Independent player characters can obviously command their own armies, but I wasn't able to find a way to allow for players to be knights in their own armies, so instead: commanders with at least 15 prowess (10 prowess if they have the Stalwart Leader perk from the right-hand Martial tree) now "lead from the front", which makes them eligible to start battlefield duels (and more likely to be targeted for them!). If using Better Battles, the decision from that mod also toggles this status.

The loser of that duel has a chance of being killed outright during the single combat duel (this can be influenced by game rules, health and prowess, their personality, or their relationship with the winner) or of being wounded (gaining a level of the wounded trait and a chance of being additionally maimed) and yielding - which then gives the winner a chance of increasing prowess or gaining a level of the Blademaster trait, and a choice to kill, capture, or release the loser.

(Note: knights captured during battle are only formally imprisoned when the battle ends )if their side loses). (Before that, they have their prowess zeroed out and are blocked from commanding an army or receiving battlefield duel events - so the battle itself should be simulated as if they aren't there at all, but after the battle they ARE still there and you don't have to reraise them)

When prisoners that are worth score in a war are captured in a battlefield duel, they are handed over to the war leader. In that case (and also when landless knights capture prisoners and hand them over to their liege) the capturing knight receives a percentage of the prisoner's ransom value immediately to represent the sale of the prisoner's carried possessions.)

This choice can effect the winner's prestige (depending on the prowess and rank of the loser), piety (depending on the rank of the loser, the winner's faith hostility level towards the loser's, and the winner's faith's pluralism doctrine and other tenets), and dread (depending on the rank of the loser).

All these outcomes are reflected in the battle summary screen just like in vanilla battles.

Regaarding Accolades:
-Acclaimed Knights currently only earn glory for death in battle if it's by other knights (ie, in single combat)

-House Paragon accolade attributes also makes knights of the liege's house less likely to be targeted for battlefield duels

-Knights with Blademaster accolade attributes also get more battlefield duel opportunities.

-Acclaimed Knights making post-yielding choices in battlefield duels now earn or lose varying amounts of glory if they have certain attributes suggesting virtues they should e exemplifying.

Specifically:
-Knights with accolade attributes in the Benevolent category (Idealist, Stalwart) gain glory for releasing yielded opponents and lose it for killing them.
-Knights with accolade attributes in the Courtly and Ethical categories (Idealist, Disciplinarian, Stalwart, Fanatic, Mentor, Charmer, Huntmaster, Master of Revels, Politicker, Reeve, Manipulator) gain glory for capturing yielded opponents and lose it for killing them.
-Knights with accolade attributes in the Righteous category (Disciplinarian, Valiant, Fanatic, Stalwart) :
-gain glory for releasing or capturing yielded opponents of their religion or a sufficiently close one (depending on pluralism doctrine), lose it for killing them
-gain glory for killing yielded opponents of a sufficiently hostile religion (depending on pluralism doctrine), lose it for releasing them
-Knights with accolades in the Dreadful, Unscrupulous, or Villainous categories (Marauder, Thug, Scoundrel) gain glory for killing yielded opponents, lose it for releasing them

Tribal claimant challenges:

It is now possible for any ruler (not just rulers of the wrong gender as in vanilla) to instead have a champion duel on their behalf.
It is now possible to refuse the duel and keep the title. This option gains the ruler 50 tyranny, loses them an entire prestige level, and gives the challenger an opinion penalty/rivalry progress towards the ruler.