Nb: Some of my "Butcher Grandpa" got battle weary too... but their ancillaries and other traits seemed enough to counter these effects effectively...I think you'll got battleweary more often if you use them on advantageous / balanced battle and lost... putting yourself at small disadvantage (especially in numbers), will give them nicer traits...
Anyhow, using "Butcher Grandpa" seems to had a nice portaits of family tree, as only the most of scarred, the most berserked, and the most mad died in battle (not surprisingly)... and when they reach 65's I will pick up nice Military-talented Highschool Boy (often their nice and peaceful Grandchildren or great grandchildren...) to step on their Grandpa's madnessMost of their dynasty though, worked as 1-2 starred FM with 3-5 influence and management skills...
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