At the same time, he extended his hand to the portable apparatus behind him and took out a custom-made grenade the size of an egg.

This hand grenade was called sonar. It would not explode, and it did not have any destructive power. However, after the sonar is activated, an ultrasound is sent out to scan the current environment. Through the Doomhammer soldier's standard battle tactics table, he could receive the feedback from the sonar to establish an environment model to provide ...