The Black Grim Smoke.

[You Killed Warthog!]

[7000 XP Earned!]

[You Killed Warthog!]

[7000 XP Earned!]

[You Killed Warthog!]

[7000 XP Earned!]

…

The three warthogs' corpses disappeared.

After killing them, Isaac walked to their digging ground. The grass ground was turned over, and it looked like they were trying to dig something valuable up.

He strapped his gun on his back and used his fingers to dig deeper into the ground. Soon, his fingertips collided with something metallic.

After moving the dirt out of the way, he could see a metal box that seemed to be rusting. Then, he took it out, and it felt surprisingly light.

There didn't seem to be a lock to open it. Isaac tried to freeze it over. Maybe that would allow it to be opened. However, after the thin layer of ice was vaporized, the box looked similar.

Then, Isaac threw it into his inventory and decided to take a good look at it later. Afterward, he resumed walking deeper into the forest.