hmmm I fixed a bunch of commonwealth spaceforms.. the Dai-Oni however just had a not totally black background.. which is even more easily replaced by a total black one.
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Dragons wanted? Try the Dragons, Magic Incarnate nation.
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The orcs would be so hard to kill because whenever a hero is on a planet it generates units. And under normal circumstances you'll almost never lose a hero. So the worse a war is going, the more units you'll have in one place until finally you have dozens of commanders together generating more units than your opponent can possibly counter without huge battlefield destroying spells, master enslave etc. The only practical way to kill them earlier on would be to assassinate the heroes.