Minefields

[NullAshton]

Mines 'ram' the opponent, and thus need structure. Just a bit of structure in itself won't do damage, which is where the warheads come in.

Of course... mines with no warheads do take less time to build... possibly use mine duds to mess with minesweepers, and in multiplayer games(and the rare mod with visible mines)freak the heck out of people when they see you have mines all over the place.