Well, if you want melee infantry that is good against Drapnai, go for the ones with almost no armour and plenty of defensive skill. That will help against the AP bonus. The high lethality will still inflict griveous casualties, as will the gnerally lower defence of no-armour infantry. But hey at least it is cheaper, thus more effective. Also, of course, pick the ones with more javelins if possible.
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