Sands of the Unseen is a Location from Zenith of the Hive.
The picture features two Danians near a plot of shining sand, as one touches the sand, he becomes invisible. As this is happening, a Mipedian is watching from on top of some rocks behind them.
Air creatures gain "Invisibility: Strike 10".
Using this in a Mipedian Invisibility Strike Deck will allow you to boost your Invisibility Strike by 10, stacking with the Creatures own Invisibility Strike if the creature has it. Combining this and Owayki can cause massive Damage when your front line creatures can do on their own 15-20 damage with their Invisibility Strike.