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BATTLE_PRESTIGE_MULTIPLIER = in defines.lua.

I've tried it with x5, it seems to work a lot better. Go on a crusade, kill 15000 saracens, your top flank leader gets something like 30 prestige.
 
x5 ? I take note. I wanted to make a small personal mod that make battle more bloody for leaders... but more rewarding in term of prestige. To give some sense of intensity in battle. To make war a bit more heroic when you search for the big epic battle that will give prestive and glory!