Note that the keep IN the influence of the mosque has a research time of 20 minutes despite me having 16 scholars ! This is NOT done. Meanwhile the keep I built in the enemy’s base has a research time of 3-ish minutes!
The techs under the keep (Fortified Villages, burning oil and the other one that reduces fire damage) suffer from an increase in their research time the more scholars you have garrisoned in the mosques / madrasa. I got to make their reserch take 40 min to finish with 21 scholars.
To replicate it you just need a Castle, mosques and a buch of scholars. Increasing the number of scholars garrisoned in the mosques results in an increase of research time to the 3 techs in the Castle. I was testing stuff out in a personalized game without any kind of opponents, with the resources set to the maximum, with the map revealed and starting from castle age.
It was REALLY taking that much time. The funny thing is that I managed to watch most of Viper’s video on the new patch, post about it on the comments of the video and come here to make this post and, still, the research still was not finished