did you hear a click?
Mines have a detection radius equal to their AoE. They can be set to trigger as soon as any target enters the radius or when a predetermined number of targets are within the radius.
Save vs luck -1 per level to avoid the mine
DR 2/ level
PD 1@level 1,4,7, and 10
AP 5@ level 1,4,7, and 10
AoE 3 hex radius + 1 at levels 1, 4, 7, and 10