Fire Wards

A magical ward. Place it on the ground, it explodes when enemies come near it. NPC also make fire wards explode. Your team can deploy at most 25 ward at the same time, so place them well. They need a few seconds to arm themselves after being placed. They damage buildings too when they explode, including your buildings. Your teammates can receive damage from the explosions too on some servers. Very similar to land mines in function, however disrupters can remove them. Human units can block the wards, reducing their effectiveness.