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Forgot to mention: the GiveHeroBattleBonus function only works in version 3.1.
GiveHeroBattleBonus didn't work, it's unclear why...:( My editor keeps crashing when I'm editing scripts, quite frequently.
I had to find a workaround using the old reliable ChangeHeroStat, even though I was told it doesn't work with negative values...:rolleyes: