February 13th, 2011, 15:48
Bobchillingworth
Unregistered
Recon units can spot them, including scouts. Hawks, floating eyes, lightbringers, Vicars, and a few other units can see them as well. The Empyrean shrine will reveal any invisible units in your territory.
You can't attack an invisible unit if you can't see it. It wouldn't be too difficult for a player to build a scout and then attack a mistform with warriors, but the issue is being able to build up a force before the mistform can kill enough of your men to become functionally invulnerable through promotions.
Best hope is that it dies trying to attack a city and doesn't get a kill. At strength 6, they aren't guaranteed to win their first combat.