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Note that this ability isn't in all my invasion mods, but it is in most of them.
Shielded wraith: place a covenant portable shield near a wraith, and set the shield's label to "create" with spawn seq 26.
Shielded ghost: same as wraith, but tilt the shield to about 25 degrees (you can experiment with what you feel looks best). Unlike the wraith, the ghost has to be on a flat surface and pointing the same direction as the shield.
Both should work with vehicles which have other forge labels too! E.g. inv_vehicle, inv_objective.