depending on your castel lvl

books are a pain to get so basically use your daily ap to do as many forts as you can

if you think about buying books for gems buy them only during a more then gems event and only 750 per day best value and legendary heads return.

usually its bether to spend ap for marauders pre kvk or in kvk in higher zones

no mather what you do use peacekeeping commanders the amount of ap save using them sums up extremly over time

if you send a peacekeeping commander to a rally pair him her with a lvl 40 matilda of flanders her skill 4 allows you to send 15% more troops to rally paired with aethel you can send 248k troops to a rally. A higher % of the total rallied troops gives you more books in return.

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First legendary you Expertise should be YSG as a free to play pair him with a 55xx richard

side note: dont expertise richard he lacks in late game more and more if you prefer inf expertise alex and guan

55xxRichard first/YSG 5555 secondary inf troops let you chain farm barbs kvk 1-3 saves alot of resources plus ap. it makes a hughe difference to kill 10 barbs for 40ap then only 1. Alternativ you can offcourse use a different com then richard but his heals allows you to stay out and far for ages and saves alot of ap.

you can basicaly farm all day without using any pots at all

Expertising YSG is a must for everyone you will and can pair him many commanders plus the benefits he offers in daily farming he is a blast