Earth Tree of Vitality!
After figuring out the secret of the level-four trial, Jacob didn't hesitate anymore. He took out multiple atomic grenades and activated them all. He threw them precisely ten meters ahead of the incoming dark beings' army.
Since all he needed to do was help the Earth Tree of Vitality devour the dark magic cores of dark beings, it was straightforward for him to use the atomic grenades.
Furthermore, those atomic grenades were now almost useless for him because they were too weak for anyone who could be called his enemy. He wasn't arrogant enough to think his current arsenal of weapons was enough to harm a legendary rank being. Because he knew he would survive without a scratch from the atomic grenades.
But it was a different story for the dark being army. In fact, this was the perfect stage for atomic grenades to perform at their full potential!
"Boom!"
"Boom!"
"Boom!"