I know a lot mechanic changes happened in the last few ages and KDs are still adapting to them. That being said here are few ideas.

1) Dragons received during war from the warring KD can't be attack for some time
- saph - 6 ticks
- gold - 12 ticks
- ruby - 18 ticks
- emerald - 24 ticks

The reason for this is the Valor sci which made dragons cost efficiency extremely low. It takes only 20k books to get 10% bonus. Instead of nerfing the sci just buff the dragons.

2) Defensive casualties
- 25% hitting into normal relation
- 50% hitting into aggressive
- 75% hitting into hostile
- 100% in war

3) Paladin casting mechanic
- it can cast only the pala unique spells on allies

I'm tired of dealing with entire kd with RM because there are 2-3 orc/pala. Just fix the mechanic

4) Replace schools with paid mechanic
- +10% book generation - 10 x land gc
- +20% book generation - 20 x land gc
- +30% book generation - 25 x land gc
- +40% book generation - 30 x land gc
- +50% book generation - 35 x land gc

5) Remove barrier rit.

6) Give stewards same abilities like monarch except replacing stewards.