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Bringing a second hero and higher tier units, will help you clear sites earlier.Losing your commander in this fight can be a worthy sacrifice, if they keep another unit from dying. You will need at least 1 hero/commander, 3 tier 2 units, and 2 more units.Modding units will greatly increase their effectiveness.Mechanical units have an inherent resistance to psionic, but are weak to arc damage.
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For example, psionic attack works great against minerals/quartzites, but not machines.
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Understand which of your units can counter each of theirs. Check the defense values and abilities for each of the enemies. Attack the landmark with a single unit (possibly a scout) to preview the enemies that you will be facing.I just posted my Beginner's Guide to Clearing Landmarks in Age of Wonders: Planetfall on youtube:
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