Goblin Land Mine..?

[smileyguyx]

Im trying to make a skill where you can place a bomb on the ground. There's a skill already called goblin land mines ( i think ) which i want to base it on but i can't seem to be able to find it. Is it an item/hero/unit skill and what is it called?

 

[BloodySkullz]

Abilities section: 'Item Place Goblin Land Mines'

 

[smileyguyx]

thanks