Exporting the meshes with the /unitbodyinspector tool will export the mesh, the texture, and the diffuse map, all as separate files, but they don't export any of the effects that are in the .dae mesh file.

This section in the .dae file shows up for the necrophage settler when opened in notepad:

  <library_effects>
    <effect id="Ch_Necro_Settler-sharedmaterial-effect">
      <profile_COMMON>
        <newparam sid="Ch_Necro_Settler_DIFF-surface">
          <surface type="2D">
            <init_from>Ch_Necro_Settler_DIFF</init_from>
          </surface>
        </newparam>
        <newparam sid="Ch_Necro_Settler_DIFF-sampler">
          <sampler2D>
            <source>Ch_Necro_Settler_DIFF-surface</source>
            <wrap_s>WRAP</wrap_s>
            <wrap_t>WRAP</wrap_t>
            <minfilter>LINEAR</minfilter>
            <magfilter>LINEAR</magfilter>
          </sampler2D>
        </newparam>
        <newparam sid="Ch_Necro_Settler_NORM-surface">
          <surface type="2D">
            <init_from>Ch_Necro_Settler_NORM</init_from>
          </surface>
        </newparam>
        <newparam sid="Ch_Necro_Settler_NORM-sampler">
          <sampler2D>
            <source>Ch_Necro_Settler_NORM-surface</source>
          </sampler2D>
        </newparam>
        <technique sid="COMMON">
          <lambert>
            <diffuse>
              <texture texture="Ch_Necro_Settler_DIFF-sampler" texcoord="UVSET0" />
            </diffuse>
          </lambert>
          <extra>
            <technique>
              <bump>
                <texture texture="Ch_Necro_Settler_NORM-sampler" texcoord="UVSET0" />
              </bump>
            </technique>
          </extra>
        </technique>
      </profile_COMMON>
    </effect>
  </library_effects>

All of the text marked in red refers to files that do not get exported by endless legend, and causes importers and viewers to fail to open the file. Deleting this section allows for the file to be opened, but textures are missing (in blender though, I haven't tried other editors).