After burrowing through the earth at frightening speeds, the Helldiver bonejack erupts from underfoot to shred every living thing within reach of its powerful jaws. The patient and methodical killer can wait in underground ambush for nearly indefinite periods, and Cryx has seeded many potential battlefields with scores of these black-iron monstrosities.
A Helldiver may NOT resurface through terrain materials restricted from burrowing. If it cannot burrow into it, then it cannot burrow out either.
However, the Helldiver may do a magic trick where it may burrow into an elevated position and surface on a nearby elevated position. Remember that you measure all distances in 3d, so you can't go 8" over and 5" up, or 2" over and 10" up... you can be placed 8" from the marker. If you're right next to a 7" cliff, you can surface on top of it.
