Tenebrous Tunnels

Seek out the source of the Taken blight on Mars. Complete mission "Tenebrous Tunnels."
"We only have a rough idea of where the Blight on Mars originates. Whatever its source, it is particularly tenacious. The Taken on Mars act with one terrible cunning, one will. And they know what they want." - Zavala
Added In
The Taken King (2015.09.09)