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If you happen to find yourself fighting against the heroine Erin (dark elves, specializes in witch's extra shot), then Jalib is the ideal choice against her standard build.
Once, I have to admit, I rushed and decided to use Earth Shock against the archmages with Jalib. Not only did I halve my own minotaurs, but the witches also finished the job with a close-range shot. (This was probably the most ridiculous move in the entire history of the Heroes series!)
In other words, Erin's special ability doesn't work very well.
The principle of defeating Jalib is to use area-of-effect spells, but Erin cannot use them without losing her special ability (Fireball does not trigger witch shots on the middle target).