My Lands: Black Gem Hunting

We are currently developing a new tank battle themed game. It shall be a shooter in PvP mode with plenty of various guns, simplest possible controls and possibility to play only on the keyboard. For killing enemies, as well as for a killing spree, tanks get short-term skills of various kind. The game stands out for its averaged dynamics and does not require super fast responses.
Now, that you have learned about the game in bare outlines, help us to decide on the the most fitting name for it. Your help is much appreciated!