One important thing to keep in mind when designing encounters for ICON is that unlike the other Mendicants as well as Leader foes, Harvesters and Chanters are not outside the triangle.
While they aren't countered by a particular role, they do absolutely counter Heavies and Skirmishers respectively, possibly even more than a Wright or a Stalwart would, depending on the build.
This means that a seemingly color balanced party can actually be significantly stronger against a certain type of enemy than expected, which can make encounters easier than intended if you, for example, use a Skirmisher elite against a party with a Chanter


